Slight cleanup of file locations in flutter_tools
to make it easier to see which files are responsible
for data reporting.

This reverts commit 5501a1c1.

Added support for a semi-transparent white overlay color for `Material` widgets to indicate their elevation in a dart theme. A new `ThemeData.applyElevationOverlayColor` flag was added to control this behavior, which is off by default for backwards compatibility reasons.

## Description

Instead of detaching from the spawned App process on the device immediately, keep the LLDB client connection open (in autopilot mode) until the App quits or the server connection is lost.

This replicates the behavior of Xcode, which also keeps a debugger attached to the App after launching it.

## Tests

This change will be covered by all running benchmarks (which are launched via "flutter run"/"flutter drive"), and probably be covered by all tests as well.

I also tested the workflow locally -- including cases where the App or Flutter CLI is terminated first.

## Breaking Change

I don't believe this should introduce any breaking changes. The LLDB client automatically exits when the app dies or the device is disconnected, so there shouldn't even be any user-visible changes to the behavior of the tool (besides the output of "-v").

Fixes https://github.com/flutter/flutter/issues/36091.

Previously, a sendRequest will be sent even if the peer is closed during
a driver test. That will cause a time out without any error information.
Such issue is unreproducible on my Mac Book Pro, but 100% reproducible
on our new Mac mini (2018).

The closing issue is tracked in https://github.com/flutter/flutter/issues/36268

Additional to this fix, we should also patch the jason_rpc_2 so the peer
will throw exception if sendRequest is attempted while the connection is
closed.

**Test**:
tiles_scroll_perf_iphonexs__timeline_summary failed without this patch.
It will pass after this patch.

I'm not sure how to add a unit test for this. Please let me know if you have
some ideas.

This patch will generate the following warning log on the new Mac Mini
```
flutter: Observatory listening on http://127.0.0.1:50192/cZPDF4sW7MM=/  
Installing and launching...                                        10.2s
00:00 +0: scrolling performance test (setUpAll)
[info ] FlutterDriver: Connecting to Flutter application at http://127.0.0.1:1069/cZPDF4sW7MM=/
[trace] FlutterDriver: Isolate found with number: 3684677742843303
[trace] FlutterDriver: Isolate is paused at start.
[trace] FlutterDriver: Attempting to resume isolate
[trace] FlutterDriver: Waiting for service extension
[info ] FlutterDriver: Connected to Flutter application.
00:00 +0: scrolling performance test complex_layout_scroll_perf
[warning] FlutterDriver: Instance of '_WebSocketImpl' is closed with an unexpected code 1005
[warning] FlutterDriver: Peer connection is closed! Trying to restore the connection...
00:10 +1: scrolling performance test tiles_scroll_perf
[warning] FlutterDriver: Instance of '_WebSocketImpl' is closed with an unexpected code 1005
[warning] FlutterDriver: Peer connection is closed! Trying to restore the connection...
00:20 +2: scrolling performance test (tearDownAll)
00:20 +2: All tests passed!
Stopping application instance.
```

https://github.com/flutter/engine/compare/3f27c5724c1d...74af88ba9f8b

git log 3f27c5724c1d92c14f8353419dfc6cb40a063aa2..74af88ba9f8bb7437edd128ad0eb1926bd2c1ee4 --no-merges --oneline
74af88ba9 Make the virtual display's window translucent (flutter/engine#9828)
bf91bdb8b Roll src/third_party/skia 563d044c0e76..9d844d8ce5a2 (10 commits) (flutter/engine#9831)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

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

If the roll is causing failures, please contact the current sheriff (garyq@google.com), and stop
the roller if necessary.

https://github.com/flutter/engine/compare/76a91d39b4b2...3f27c5724c1d

git log 76a91d39b4b256ef95170ed2d93fccca3c0a0d49..3f27c5724c1d92c14f8353419dfc6cb40a063aa2 --no-merges --oneline
3f27c5724 Roll fuchsia/sdk/core/mac-amd64 from pU_n3ahOhH6HJhE4vs5pUR8cg5U22TItP_Ds_N2OXPIC to qFyiJ56_6XZ5fjNssdCk_vOtBHg4YdWAPNeMIAf07-gC (flutter/engine#9830)
eb4793abf Revert "Roll src/third_party/dart 24725a8559..cbaf890f88 (33 commits) (#9826)" (flutter/engine#9829)
9c54621fd bitcode (flutter/engine#9823)
e105a8982 Roll src/third_party/dart 24725a8559..cbaf890f88 (33 commits) (flutter/engine#9826)
2e83c4a35 Roll fuchsia/sdk/core/linux-amd64 from ehWVT9QJbC-vFMM6SkkQM9HJ9oITFCws7FC9JnrFq2gC to IPgI5Uh4rIZ4zNfAV1_ynC4dGmFLexAW1L9czHUyjowC (flutter/engine#9827)
418fe5b2d Document FontFeature class (flutter/engine#9808)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

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

If the roll is causing failures, please contact the current sheriff (garyq@google.com), and stop
the roller if necessary.

https://github.com/flutter/engine/compare/919e3532368f...76a91d39b4b2

git log 919e3532368fa1924614272b8dc88874c603fcff..76a91d39b4b256ef95170ed2d93fccca3c0a0d49 --no-merges --oneline
76a91d39b Roll src/third_party/skia 8590026dbf0d..563d044c0e76 (38 commits) (flutter/engine#9824)
8143845b7 Roll fuchsia/sdk/core/mac-amd64 from olF8ZjlM3lWSmWq8XyfXTKoPveuZtTcrGJINk_ERHhwC to pU_n3ahOhH6HJhE4vs5pUR8cg5U22TItP_Ds_N2OXPIC (flutter/engine#9820)
379028ab6 Add the functionality to merge and unmerge MessageLoopTaskQueues (flutter/engine#9436)
8abe85bb9 Revert "Roll src/third_party/dart 24725a8559..28f95fcd24 (32 commits)" (flutter/engine#9817)
96746bc66 Roll src/third_party/skia c3f28e3cf0d4..8590026dbf0d (2 commits) (flutter/engine#9805)
3652a68eb Roll fuchsia/sdk/core/mac-amd64 from CDbRdGJ3bu-aWMCZqN5VzfQqIBwDGL2wfFodWABKdCIC to olF8ZjlM3lWSmWq8XyfXTKoPveuZtTcrGJINk_ERHhwC (flutter/engine#9803)
67d284d45 Roll src/third_party/dart 24725a8559..28f95fcd24 (32 commits)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

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

If the roll is causing failures, please contact the current sheriff (garyq@google.com), and stop
the roller if necessary.

This updates the flutter tool cache to download binary files for ideviceinstaller, ios-deploy, libimobiledevice, and dynamically linked dependencies from Flutter's GCP bucket.

Move tools tests into a general.shard directory in preparation to changing how we shard tools tests (#36108)

https://github.com/flutter/engine/compare/d1dcd1848633...919e3532368f

git log d1dcd1848633c5764e23313823445cbcba451a59..919e3532368fa1924614272b8dc88874c603fcff --no-merges --oneline
919e35323 Only release the image data in the unit-test once Skia has accepted ownership of it. (flutter/engine#9816)
b42450f2b Document //flutter/shell/common/engine. (flutter/engine#9769)
f3edc41e6 Update buildroot to c4df4a7b to pull in MSVC 2017 Update 9 on Windows. (flutter/engine#9799)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

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

If the roll is causing failures, please contact the current sheriff (garyq@google.com), and stop
the roller if necessary.

Revert "Merge branches 'master' and 'master' of github.com:flutter/flutter into timsneath-precache2" (#36096)

This reverts commit eb0b1790.
Skia Gold post-submit test were failing due to the service account not being found on Cirrus.

* Fresh PR for Gold integration.

* Nits

* WIP

* Artifacts from merge

* Changed some platform dependencies for web, added library prefix notation for Skia Gold test names.

* Updating for CI implementation

* Write out service account

* Writing to skip out

* WIP

* ++

* Fixing depot tools deps

* Windows depot_tools

* Fixing setup scripts

* ++

* depot tools

* ++

* WIP

* Tracing depot_tools clone

* WIP

* ++

* analyzer

* WIP

* chrome typo

* copy artifact

* Working on tests

* Code cleanup

* ++

* Code cleanup, updated tests

* ++ review feedback

* Review

* Analyzer

* Review feedback

* Nits from review

* PRogress

* ++

* Fixing tests

* ++

* Testing repo route

* Just needing documention around new structures.

* cleanup

* Analyzer

* Documentation updates

* Documentation updates

* Cirrus updates

* cirrus nit

* Review feedback

* Review feedback

* Fixing skip comparator

* Fix base directory for Skia Gold case

* ++

* Feedback

* ++

* Fixed uri assertion

* Made GoldensClient abstract, altered SkiaGoldClient constructor

* Analyzer

This reverts commit 14d489ad.

This updates the flutter tool to cache binary files for ideviceinstaller, ios-deploy, libimobiledevice, and dynamically linked dependencies from Flutter's GCP bucket.

https://github.com/flutter/engine/compare/55a2b81e40bf...d1dcd1848633

git log 55a2b81e40bf91f73a8265b54b73a2d62197d024..d1dcd1848633c5764e23313823445cbcba451a59 --no-merges --oneline
d1dcd1848 Remove breaking asserts (flutter/engine#9797)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

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

If the roll is causing failures, please contact the current sheriff (garyq@google.com), and stop
the roller if necessary.