Partial work towards https://github.com/flutter/flutter/issues/132245.

I have to admit I don't totally understand what I've updated, or whether
there are more integration points needed.

https://github.com/flutter/engine/compare/b019ac62f21f...18a71c031f5f

2023-08-10 chris@bracken.jp [shell] Add references to VsyncWaiter docs (flutter/engine#44607)
2023-08-10 skia-flutter-autoroll@skia.org Roll Skia from b6492f5ce8c3 to b001e0a5e46f (1 revision) (flutter/engine#44606)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC chinmaygarde@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

https://github.com/flutter/engine/compare/16b01b98af20...b019ac62f21f

2023-08-10 skia-flutter-autoroll@skia.org Roll Fuchsia Mac SDK from SoKcmsZ5H8uHJXV1S... to hdjihTvRxbNprHI9x... (flutter/engine#44600)

Also rolling transitive DEPS:
  fuchsia/sdk/core/mac-amd64 from SoKcmsZ5H8uH to hdjihTvRxbNp

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC chinmaygarde@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Partial work towards https://github.com/flutter/flutter/issues/132245.

Other than updating error messages, and passing `$LOCAL_ENGINE_HOST`
downwards, this PR should not change the behavior of any existing
workflows or code (i.e. it's purely additive).

The skeleton id needed to be updated to be sent to app store or play store

https://github.com/flutter/engine/compare/a9be77e6f475...16b01b98af20

2023-08-10 skia-flutter-autoroll@skia.org Roll Dart SDK from 46da53e7abe2 to a2eac00da6b8 (1 revision) (flutter/engine#44601)
2023-08-10 huxiaohu2007@gmail.com Fix unexpected pointer change issue and Add test case (flutter/engine#43949)
2023-08-10 47866232+chunhtai@users.noreply.github.com Reland "Android a11y bridge sets importantness" (flutter/engine#44589)
2023-08-10 john@johnmccutchan.com Support for Android Platform Views under Impeller/Vulkan (flutter/engine#44571)
2023-08-10 109111084+yaakovschectman@users.noreply.github.com Reintroduce Windows lifecycle with guard for posthumous `OnWindowStateEvent` (flutter/engine#44344)
2023-08-10 skia-flutter-autoroll@skia.org Roll Skia from 92e6f52b0fa8 to b6492f5ce8c3 (1 revision) (flutter/engine#44597)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC chinmaygarde@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Fixes https://github.com/flutter/flutter/issues/132157

* Pulled `FinderBase` out of `Finder`
  * `FinderBase` can be used for any object, not just elements
  * Terminology was updated to be more "find" related
* Re-implemented `Finder` using `FinderBase<Element>`
  * Backwards compatibility maintained with `_LegacyFinderMixin`
* Introduced base classes for SemanticsNode finders
* Introduced basic SemanticsNode finders through `find.semantics`
* Updated some relevant matchers to make use of the more generic `FinderBase`

Closes #123634
Closes #115874

This change makes sure the style provided through the `TextField`s `style` parameter is resolved for material states before merging it with defaults.

Fixes #132212

Fixes https://github.com/flutter/flutter/issues/12296

https://github.com/flutter/engine/compare/ea7730c16301...a9be77e6f475

2023-08-10 55360120+Matt2D@users.noreply.github.com Flutter iOS Interactive Keyboard: Fixing Behavior Issue  (flutter/engine#44586)
2023-08-10 bdero@google.com [Impeller] Flutter GPU: Add context override. (flutter/engine#44566)
2023-08-10 bdero@google.com [Impeller] External OpenGLES texture sampling. (flutter/engine#44559)
2023-08-10 skia-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from 961_tJawsbLMdy5i0... to konJQZKk2qXc276iA... (flutter/engine#44593)
2023-08-10 skia-flutter-autoroll@skia.org Roll Skia from 364900538771 to 92e6f52b0fa8 (1 revision) (flutter/engine#44592)
2023-08-10 skia-flutter-autoroll@skia.org Roll Skia from f39fd2de8f10 to 364900538771 (1 revision) (flutter/engine#44590)

Also rolling transitive DEPS:
  fuchsia/sdk/core/linux-amd64 from 961_tJawsbLM to konJQZKk2qXc

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC chinmaygarde@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Implement expected functionalities when supplying `--web-launch-url` and/or `--web-hostname` arguments to `flutter drive`.
- `--web-launch-url` now sets the starting url for the (headless) browser
  - Which for example means you can start at a certain part of the app at the start of your integration test
- `--web-hostname` now sets the hostname where the target of flutter drive will be hosted
  - Which allows you to set something other than localhost (allowing access via a reverse-proxy for example)

Fixes #118028

Undo temporary changes made in #132094

Adds a getter to access the value of the private `RestorableBool _hasInteractedByUser`.

*List which issues are fixed by this PR. You must list at least one issue.*
Fixes #131538

https://github.com/flutter/engine/compare/e2ed1bebf31d...ea7730c16301

2023-08-10 skia-flutter-autoroll@skia.org Roll Skia from 67bad75b41c2 to f39fd2de8f10 (1 revision) (flutter/engine#44588)
2023-08-10 skia-flutter-autoroll@skia.org Roll Dart SDK from d89e4ead966d to 46da53e7abe2 (4 revisions) (flutter/engine#44584)
2023-08-10 skia-flutter-autoroll@skia.org Roll Skia from aac2d55d35eb to 67bad75b41c2 (1 revision) (flutter/engine#44583)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC chinmaygarde@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Fixes: https://github.com/flutter/flutter/issues/124970
Part of https://github.com/flutter/flutter/issues/47161

Before this change, there were two places we overrode the `Artifacts` in a Zone:

1. if/when we parse local-engine CLI options: https://github.com/flutter/flutter/blob/1cf3907407cbc91be7cec2c38b348a2d66041dd5/packages/flutter_tools/lib/src/runner/flutter_command_runner.dart#L281
2. an additional override for fuchsia platform dill (no longer used, deleted in this PR): https://github.com/flutter/flutter/blob/1cf3907407cbc91be7cec2c38b348a2d66041dd5/packages/flutter_tools/lib/src/commands/attach.dart#L274

Note 1 above creates a new instance of `Artifacts.getLocalEngine()`. In this flow, there exist two instances of `Artifacts`:

1. The default fallback instance of `CachedArtifacts` (which gets all artifacts from flutter/bin/cache), instantiated in context_runner.dart: https://github.com/flutter/flutter/blob/1cf3907407cbc91be7cec2c38b348a2d66041dd5/packages/flutter_tools/lib/src/context_runner.dart#L137
2. An instance of `CachedLocalEngineArtifacts` created in the command runner once the CLI options have been parsed: https://github.com/flutter/flutter/blob/1cf3907407cbc91be7cec2c38b348a2d66041dd5/packages/flutter_tools/lib/src/runner/flutter_command_runner.dart#L281

The regression happened when we direct injected the Artifacts 1 from above BEFORE we parsed the local-engine flag, and then used this in the second zone override, and then when creating the `FlutterDevice` there are multiple calls to `globals.artifacts` returned it when it should have returned Artifacts 2: https://github.com/flutter/flutter/blob/1cf3907407cbc91be7cec2c38b348a2d66041dd5/packages/flutter_tools/lib/src/resident_runner.dart#L80

Device.artifactOverrides was originally introduced in https://github.com/flutter/flutter/pull/32071, but is no longer used, so I deleted it.

I also removed direct injection of `Artifacts` to the attach sub-command, because that class now no longer references artifacts.

I believe the ideal true fix for this would be to:

1. Migrate all leaf calls to `globals.artifacts` to use direct injection (in this case, the offending invocations were in [`FlutterDevice.create()`](https://github.com/flutter/flutter/blob/1cf3907407cbc91be7cec2c38b348a2d66041dd5/packages/flutter_tools/lib/src/resident_runner.dart#L80-L218), but I'm not sure that something else would not have broken later)
2. Ensure we are always direct injecting the desired instance of `Artifacts`--that is, if the user desires local engine artifacts, that we are passing an instance of `CachedLocalEngineArtifacts`.
  a. Alternatively, and probably simpler, teach `CachedArtifacts` to know about the local engine. This would mean parsing the global CLI options BEFORE we ever construct any instance of `Artifacts`.
  
As an overall recommendation for implementing https://github.com/flutter/flutter/issues/47161, in the overall tree of tool function calls, we should probably migrate the leaves first (that is, migrate the sub-commands last). We should also audit and reconsider any usage of `runZoned()` or `context.run()` for the purpose overriding zoneValues.

Fixes https://github.com/flutter/flutter/issues/132274.

https://github.com/flutter/engine/compare/3359d6696da4...e2ed1bebf31d

2023-08-10 skia-flutter-autoroll@skia.org Roll Skia from 7a1fec6b197f to aac2d55d35eb (1 revision) (flutter/engine#44582)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC chinmaygarde@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Closes https://github.com/flutter/flutter/issues/132162.

I did a tiny bit of minor cleanup but didn't want to go 🍔 beyond the
scope of this change. After it lands I'll update the Wiki.

## Before

```bash
$ fl run \
  --local-engine-src-path=$ENGINE \
  --local-engine=android_debug_unopt_arm64
```

... would try to use `host_debug_unopt` (i.e. Rosetta).

## After

```bash
$ fl run \
  --local-engine-src-path=$ENGINE \
  --local-engine=android_debug_unopt_arm64 \
  --local-engine-host=host_debug_unopt_arm64
```

... uses `host_debug_unopt_arm64`, as specified.

---

/cc @jonahwilliams @gaaclarke @zanderso

Context:
https://github.com/flutter/flutter/commit/aff8ef13d428395725ce8f836ca771b8bf2d87db

Fix `PopupMenuItem` & `CheckedPopupMenuItem` has redundant `ListTile` padding and update default horizontal padding for Material 3 (#131609)

fixes [`PopupMenuItem` adds redundant padding when using `ListItem`](https://github.com/flutter/flutter/issues/128553)

### Description

- Fixed redundant `ListTile` padding when using `CheckedPopupMenuItem` or  `PopupMenuItem`  with the `ListTile` child for complex popup menu items as suggested in the docs.
- Updated default horizontal padding for popup menu items.

### Code sample

<details> 
<summary>expand to view the code sample</summary> 

```dart
import 'package:flutter/material.dart';

/// Flutter code sample for [PopupMenuButton].

// This is the type used by the popup menu below.
enum SampleItem { itemOne, itemTwo, itemThree }

void main() => runApp(const PopupMenuApp());

class PopupMenuApp extends StatelessWidget {
  const PopupMenuApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(useMaterial3: true),
      home: const PopupMenuExample(),
    );
  }
}

class PopupMenuExample extends StatefulWidget {
  const PopupMenuExample({super.key});

  @override
  State<PopupMenuExample> createState() => _PopupMenuExampleState();
}

class _PopupMenuExampleState extends State<PopupMenuExample> {
  SampleItem? selectedMenu;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('PopupMenuButton')),
      body: Center(
        child: SizedBox(
          width: 150,
          height: 100,
          child: Align(
            alignment: Alignment.topLeft,
            child: PopupMenuButton<SampleItem>(
              initialValue: selectedMenu,
              // Callback that sets the selected popup menu item.
              onSelected: (SampleItem item) {
                setState(() {
                  selectedMenu = item;
                });
              },
              itemBuilder: (BuildContext context) =>
                  <PopupMenuEntry<SampleItem>>[
                const PopupMenuItem<SampleItem>(
                  value: SampleItem.itemOne,
                  child: Text('PopupMenuItem'),
                ),
                const CheckedPopupMenuItem<SampleItem>(
                  checked: true,
                  value: SampleItem.itemTwo,
                  child: Text('CheckedPopupMenuItem'),
                ),
                const PopupMenuItem<SampleItem>(
                  value: SampleItem.itemOne,
                  child: ListTile(
                    leading: Icon(Icons.cloud),
                    title: Text('ListTile'),
                    contentPadding: EdgeInsets.zero,
                    trailing: Icon(Icons.arrow_right_rounded),
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}
``` 
	
</details>

### Before

![image](https://github.com/flutter/flutter/assets/48603081/aad15ffb-ca11-4997-81d1-b46288161a4e)

- Default horizontal padding is the same as M2 (16.0), while the specs use a smaller value (12.0)
- `ListTile` nested by default in `CheckedPopupMenuItem` has redundant padding
- `PopupMenuItem` using `ListTile` as a child for complex menu items contains redundant padding.

![Screenshot 2023-07-31 at 17 17 08](https://github.com/flutter/flutter/assets/48603081/75ad1fe5-e051-42ba-badf-e20c799dee96)

### After 

- Default horizontal padding is updated for Material 3.
- `PopupMenuItem` & `CheckedPopupMenuItem` override `ListTile` padding (similar to how `ExpansionTile` overrides `ListTile` text and icon color.

![Screenshot 2023-07-31 at 17 17 25](https://github.com/flutter/flutter/assets/48603081/288cf892-5b51-4365-9855-5ef0ed2928e9)

https://github.com/flutter/engine/compare/2fe84892b90a...3359d6696da4

2023-08-10 skia-flutter-autoroll@skia.org Roll Skia from a3975f2a9e79 to 7a1fec6b197f (1 revision) (flutter/engine#44580)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC chinmaygarde@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

https://github.com/flutter/engine/compare/02ac5e84097b...2fe84892b90a

2023-08-10 skia-flutter-autoroll@skia.org Roll Skia from d9e9b7073171 to a3975f2a9e79 (2 revisions) (flutter/engine#44577)
2023-08-10 skia-flutter-autoroll@skia.org Roll Fuchsia Mac SDK from zoCGnScKZWbm5s9Hy... to SoKcmsZ5H8uHJXV1S... (flutter/engine#44576)

Also rolling transitive DEPS:
  fuchsia/sdk/core/mac-amd64 from zoCGnScKZWbm to SoKcmsZ5H8uH

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC chinmaygarde@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

fixes [BUG: DropdownButtonFormField input decorator focus/hover is not clipped
](https://github.com/flutter/flutter/issues/131282)

### Description

This fixes an issue where `DropdownButtonFormField`'s input border isn't used for clipping with `InkWell`.

### Before
![Screenshot 2023-07-28 at 17 06 20](https://github.com/flutter/flutter/assets/48603081/8fe1ee1f-5cea-4297-b4f6-e672d74bb583)

### After
![Screenshot 2023-07-28 at 17 06 38](https://github.com/flutter/flutter/assets/48603081/a0091459-67dc-45ca-96b1-95d7093d475f)

https://github.com/flutter/engine/compare/9117ff27d9c9...02ac5e84097b

2023-08-10 skia-flutter-autoroll@skia.org Roll Skia from 7c5f6b17a998 to d9e9b7073171 (1 revision) (flutter/engine#44573)
2023-08-10 skia-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from ZCP8LDbKF4LTBFz_W... to 961_tJawsbLMdy5i0... (flutter/engine#44572)

Also rolling transitive DEPS:
  fuchsia/sdk/core/linux-amd64 from ZCP8LDbKF4LT to 961_tJawsbLM

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC chinmaygarde@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

https://github.com/flutter/engine/compare/b5b41ff66dae...9117ff27d9c9

2023-08-10 zanderso@users.noreply.github.com Revert "Android a11y bridge sets importantness" (flutter/engine#44569)
2023-08-10 skia-flutter-autoroll@skia.org Roll Skia from 491f67637e6e to 7c5f6b17a998 (2 revisions) (flutter/engine#44568)
2023-08-10 matanlurey@users.noreply.github.com [Impeller] Replace Vulkan rotation checks with polling (flutter/engine#44361)
2023-08-10 31859944+LongCatIsLooong@users.noreply.github.com Disable text rounding hack by default (flutter/engine#44544)
2023-08-09 skia-flutter-autoroll@skia.org Roll Skia from 3d5a6138b7e5 to 491f67637e6e (4 revisions) (flutter/engine#44563)
2023-08-09 skia-flutter-autoroll@skia.org Manual roll Dart SDK from f664f4b9c50d to d89e4ead966d (11 revisions) (flutter/engine#44560)
2023-08-09 58529443+srujzs@users.noreply.github.com Make toJS'd function use JS types (flutter/engine#44469)
2023-08-09 xty50337@hotmail.com [web] Fix rendering of gradients in html mode (flutter/engine#40345)
2023-08-09 55360120+Matt2D@users.noreply.github.com Flutter iOS Interactive Keyboard: Fixing Animation Issue (flutter/engine#44514)
2023-08-09 skia-flutter-autoroll@skia.org Roll Skia from 8c9a8d3e073c to 3d5a6138b7e5 (4 revisions) (flutter/engine#44557)
2023-08-09 skia-flutter-autoroll@skia.org Roll Skia from d210bab77137 to 8c9a8d3e073c (1 revision) (flutter/engine#44555)
2023-08-09 skia-flutter-autoroll@skia.org Roll Skia from 25aedb939915 to d210bab77137 (2 revisions) (flutter/engine#44550)
2023-08-09 skia-flutter-autoroll@skia.org Roll Fuchsia Mac SDK from e7bMhkfY-RPMrSMhB... to zoCGnScKZWbm5s9Hy... (flutter/engine#44548)
2023-08-09 skia-flutter-autoroll@skia.org Roll Skia from 17ba2122707b to 25aedb939915 (3 revisions) (flutter/engine#44547)
2023-08-09 47866232+chunhtai@users.noreply.github.com Android a11y bridge sets importantness (flutter/engine#44452)
2023-08-09 skia-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from tO6r8iQqnmsYkLcvZ... to ZCP8LDbKF4LTBFz_W... (flutter/engine#44545)

Also rolling transitive DEPS:
  fuchsia/sdk/core/linux-amd64 from tO6r8iQqnmsY to ZCP8LDbKF4LT
  fuchsia/sdk/core/mac-amd64 from e7bMhkfY-RPM to zoCGnScKZWbm

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC chinmaygarde@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Fixes https://github.com/flutter/flutter/issues/126297

This adds support for keep alive to the 2D scrolling foundation. The TwoDimensionalChildBuilderDelegate and TwoDimensionalChildListDelegate will both add automatic keep alives to their children, matching the convention from SliverChildDelegates. The TwoDimensionalViewportParentData now incorporates keep alive and which is managed by the RenderTwoDimensionalViewport.

## Pre-launch Checklist

- [ ] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [ ] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [ ] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [ ] I signed the [CLA].
- [ ] I listed at least one issue that this PR fixes in the description
above.
- [ ] I updated/added relevant documentation (doc comments with `///`).
- [ ] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [ ] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel
on [Discord].

<!-- Links -->
[Contributor Guide]:
https://github.com/flutter/flutter/wiki/Tree-hygiene#overview
[Tree Hygiene]: https://github.com/flutter/flutter/wiki/Tree-hygiene
[test-exempt]:
https://github.com/flutter/flutter/wiki/Tree-hygiene#tests
[Flutter Style Guide]:
https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo
[Features we expect every widget to implement]:
https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#features-we-expect-every-widget-to-implement
[CLA]: https://cla.developers.google.com/
[flutter/tests]: https://github.com/flutter/tests
[breaking change policy]:
https://github.com/flutter/flutter/wiki/Tree-hygiene#handling-breaking-changes
[Discord]: https://github.com/flutter/flutter/wiki/Chat

Use a null-aware `?.` operator instead of a conditional operator. This complies with the `prefer_null_aware_operators` rule. Fixes https://github.com/flutter/flutter/issues/132241

*If you had to change anything in the [flutter/tests] repo, include a link to the migration guide as per the [breaking change policy].*

Migrate tests in flutter/flutter. Once the tests here and in `*_customer_testing` are migrated, the default value of the migration flag will be changed from false to true, making the rounding hack disabled by default.

Context: https://github.com/flutter/flutter/issues/131862

This PR injects a "realm" component to the storage base URL when the contents of the file `bin/internal/engine.realm` is non-empty.

As documented in the PR, when the realm is `flutter_archives_v2`, and `bin/internal/engine.version` contains the commit hash for a commit in a `flutter/engine` PR, then the artifacts pulled by the tool will be the artifacts built by the presubmit checks for the PR.

This works for everything but the following two cases:
1. Fuchsia artifacts are not uploaded to CIPD by the Fuchsia presubmit builds.
2. Web artifacts are not uploaded to gstatic by the web engine presubmit builds.

For (1), the flutter/flutter presubmit `fuchsia_precache` is driven by a shell script outside of the repo. It will fail when the `engine.version` and `engine.realm` don't point to a post-submit engine commit.

For (2), the flutter/flutter web presubmit tests that refer to artifacts in gstatic hang when the artifacts aren't found, so this PR skips them.

Also:
- minor improvements to documentation
- wrap one of our test error messages in a manner more consistent with other messages

See title.

Final part of https://github.com/flutter/flutter/issues/123346.

By default, Flutter web uses the browser's built-in context menu.

<img width="200" src="https://github.com/flutter/flutter/assets/389558/990f99cb-bc38-40f1-9e88-8839bc342da5" />

As of [recently](https://github.com/flutter/engine/pull/38682), it's possible to use a Flutter-rendered context menu like the other platforms.

```dart
void main() {
  runApp(const MyApp());
  BrowserContextMenu.disableContextMenu();
}
```

But there is a bug (https://github.com/flutter/flutter/issues/129692) that the Paste button is missing and never shows up.

<img width="284" alt="Screenshot 2023-08-07 at 2 39 03 PM" src="https://github.com/flutter/flutter/assets/389558/f632be25-28b1-4e2e-98f7-3bb443f077df">

The reason why it's missing is that Flutter first checks if there is any pasteable text on the clipboard before deciding to show the Paste button using the `hasStrings` platform channel method, but that was never implemented for web ([original hasStrings PR](https://github.com/flutter/flutter/pull/87678)).

So let's just implement hasStrings for web?  No, because Chrome shows a permissions prompt when the clipboard is accessed, and there is [no browser clipboard API](https://developer.mozilla.org/en-US/docs/Web/API/Clipboard_API) to avoid it.  The prompt will show immediately when the EditableText is built, not just when the Paste button is pressed.

<img width="200" src="https://github.com/flutter/flutter/assets/389558/5abdb160-1b13-4f1a-87e1-4653ca19d73e" />

### This PR's solution

Instead, before implementing hasStrings for web, this PR disables the hasStrings check for web.  The result is that users will always see a paste button, even in the (unlikely) case that they have nothing pasteable on the clipboard.  However, they will not see a permissions dialog until they actually click the Paste button.  Subsequent pastes don't show the permission dialog.

<details>

<summary>Video of final behavior with this PR</summary>

https://github.com/flutter/flutter/assets/389558/ed16c925-8111-44a7-99e8-35a09d682748

</details>

I think this will be the desired behavior for the vast majority of app developers.  Those that want different behavior can use hasStrings themselves, which will be implemented in https://github.com/flutter/engine/pull/43360.

### References

Fixes https://github.com/flutter/flutter/issues/129692
Engine PR to be merged after this: https://github.com/flutter/engine/pull/43360