This updates `AsyncSnapshot.data` to act as `AsyncSnapshot.requireData`
used to -- and it removes `AsyncSnapshot.requireData`. Correspondingly,
this adds a `StreamBuilder.withoutInitialData()` constructor, makes the
`initialData` argument to the default `StreamBuilder()` constructor required,
and deprecates the `initialData` argument to the `FutureBuilder()` constructor.

See the  breaking change announcement for more info.

https://github.com/flutter/flutter/issues/34545
https://groups.google.com/forum/#!topic/flutter-announce/H6Od0QdsdrI

This PR makes ModalBarrier dismiss modal with any button press instead of primary button up, by making it use a private recognizer _AnyTapGestureRecognizer that claims victor and calls onAnyTapDown immediately after it receives any PointerDownEvent.

This is a partial re-application of #24669, which was
reverted due to Fuchsia breakages.

https://github.com/flutter/flutter/issues/24413

* Implement InputDecorationTheme copyWith, ==, hashCode 

This is the first step in getting esoteric devices wired
up to device lab to ensure that we can at least start Flutter
apps in profile mode on such devices.

https://github.com/flutter/flutter/issues/35838

This reverts commit ab26e1b4.

https://github.com/flutter/engine/compare/f3482700474a...1af19ae67dd1

git log f3482700474a791dabe9c4783568ed0fe512b04d..1af19ae67dd16e5f6e601daa38745b073730e450 --no-merges --oneline
1af19ae67 Roll fuchsia/sdk/core/mac-amd64 from PHtpiJGexJFgd7sgPTUbFphKES09fzotmtrO2kTHI08C to JDPk4JFZX16IXpzzjQH5KFf0vRALbOtJYiMHCqFLFOQC (flutter/engine#9892)
5d9f7b18e Log dlopen errors only in debug mode (flutter/engine#9890)
8f060b995 Add clang version to Info.plist (flutter/engine#9873)
0fcf3b3ef Roll src/third_party/skia e574f1e409aa..d7639aff1001 (16 commits) (flutter/engine#9889)

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https://github.com/flutter/engine/compare/8849d3092d5a...f3482700474a

git log 8849d3092d5aa6866501663cd62397f1a1564e67..f3482700474a791dabe9c4783568ed0fe512b04d --no-merges --oneline
f34827004 Simplify buildtools (flutter/engine#9875)

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Using custom exception class for network loading error

* add failing tests

* fix tests

* be more specific with try-catch

* add further mocking to get tests to pass again

* fix analyzer failure

https://github.com/flutter/engine/compare/eb248c242574...8849d3092d5a

git log eb248c242574e8f7f4d4b4532b6db21dfbe1a5a0..8849d3092d5aa6866501663cd62397f1a1564e67 --no-merges --oneline
8849d3092 Add multi-line flag to semantics (flutter/engine#9850)
91e7a7671 Roll src/third_party/dart 24725a8559..2b3336b51e (108 commits) (flutter/engine#9883)
3cd3e5e72 Roll fuchsia/sdk/core/mac-amd64 from x0S8o-I3LOxltQzGPHsScGKtGALS89j7LYlSANNF-T8C to PHtpiJGexJFgd7sgPTUbFphKES09fzotmtrO2kTHI08C (flutter/engine#9885)
cd321ee29 Assign missing headless execution variable (flutter/engine#9855)
3186ffe30 Roll src/third_party/skia 63fdd0191be0..e574f1e409aa (1 commits) (flutter/engine#9882)
9c9daa0cb Roll fuchsia/sdk/core/mac-amd64 from f97PVV8BR3sa4rxRIc-xgvBxd6HYa8mKNp8zGmqqx-UC to x0S8o-I3LOxltQzGPHsScGKtGALS89j7LYlSANNF-T8C (flutter/engine#9881)

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Fixes RenderSliverFixedExtentBoxAdaptor correctly calculates leadingGarbage and trailingGarbage. (#36302)

* Add clarifying docs on MaterialButton.colorBrightness

FocusTraversalPolicy keep the previously visited node to avoid hysteresis. But even if the visited focus has been disposed, FocusTraversalPolicy will still use it to requestFocus, which will cause FocusManger to get an abandoned node to get the focus.

This reverts commit 39baa099.

Update `FakeHttpClientResponse` to be impervious to Dart SDK
changes to the `HttpClientResponse` stream type (between `List<int>`
and `Uint8List`).

This PR created a main page for platform view tests in the android views testing app. The main page none contains a list of the links to the pages being tested. It puts the android view motion events tests to a sub page.
The PR also added iOS related files to get ready for adding the iOS platform views tests.

eb248c242 Roll src/third_party/skia 14b5e6bb8fcf..63fdd0191be0 (2 commits) (flutter/engine#9880) (#36361)


https://github.com/flutter/engine/compare/00acf2a18065...eb248c242574

git log 00acf2a180651cbf1e480316d7d64af8a62dcf47..eb248c242574e8f7f4d4b4532b6db21dfbe1a5a0 --no-merges --oneline
eb248c242 Roll src/third_party/skia 14b5e6bb8fcf..63fdd0191be0 (2 commits) (flutter/engine#9880)

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00acf2a18 Roll fuchsia/sdk/core/mac-amd64 from w823y-1sH6L6jGXwMOrVkgZMGP2zpKnNUzyvshzPlFMC to f97PVV8BR3sa4rxRIc-xgvBxd6HYa8mKNp8zGmqqx-UC (flutter/engine#9879) (#36357)


https://github.com/flutter/engine/compare/98241b7b05aa...00acf2a18065

git log 98241b7b05aa605755dc87ce33c7f6fb189d4863..00acf2a180651cbf1e480316d7d64af8a62dcf47 --no-merges --oneline
00acf2a18 Roll fuchsia/sdk/core/mac-amd64 from w823y-1sH6L6jGXwMOrVkgZMGP2zpKnNUzyvshzPlFMC to f97PVV8BR3sa4rxRIc-xgvBxd6HYa8mKNp8zGmqqx-UC (flutter/engine#9879)

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https://github.com/flutter/engine/compare/f336286cde9c...98241b7b05aa

git log f336286cde9c17d4aa36e3217f91cc0b239a3391..98241b7b05aa605755dc87ce33c7f6fb189d4863 --no-merges --oneline
98241b7b0 Roll src/third_party/skia 08ba11370342..14b5e6bb8fcf (3 commits) (flutter/engine#9874)
d4cb3e6e4 Roll fuchsia/sdk/core/mac-amd64 from xJPmd7maxxcPRu9HpByelwYaqa-v6qipCfy6JhgYS9oC to w823y-1sH6L6jGXwMOrVkgZMGP2zpKnNUzyvshzPlFMC (flutter/engine#9871)
4f307785f Update buildroot to pick up Fuchsia artifact roller. (flutter/engine#9866)

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

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https://github.com/flutter/engine/compare/e3e4b26fce0d...f336286cde9c

git log e3e4b26fce0de9d4aa870835ffad24e6817a08ce..f336286cde9c17d4aa36e3217f91cc0b239a3391 --no-merges --oneline
f336286cd Roll src/third_party/skia 947efe28de74..08ba11370342 (9 commits) (flutter/engine#9865)
dcac8a9c9 Fixed error in generated xml Info.plist. (flutter/engine#9867)
b7e5940e3  Started adding the engine hash to frameworks' Info.plist. (flutter/engine#9847)

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

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https://github.com/flutter/engine/compare/66092d5b02dc...e3e4b26fce0d

git log 66092d5b02dcaf627295c5d5333956ebc82ad53b..e3e4b26fce0de9d4aa870835ffad24e6817a08ce --no-merges --oneline
e3e4b26fc Roll fuchsia/sdk/core/mac-amd64 from pwsYtqWGHRP43dB0EyLu7S9R3uGV0dIhulPbnSUDUmcC to xJPmd7maxxcPRu9HpByelwYaqa-v6qipCfy6JhgYS9oC (flutter/engine#9858)
3233f9422 Disable Fuchsia Debug & Release presubmits and only attempt the Profile unopt variant. (flutter/engine#9856)
6e1a3e812 Roll src/third_party/skia a3e2996b0834..947efe28de74 (6 commits) (flutter/engine#9853)
9eed783e9 Selectively enable tests that work on Windows and file issues for ones that don't. (flutter/engine#9852)
7ae3c3e11 Preserve the alpha for VD content by setting a transparent background. (flutter/engine#9849)
a3926a3c6 Roll fuchsia/sdk/core/mac-amd64 from 94o0_NIcwi-V68SmUN4hU0fX5_JkMpPU5V8HaFvKWfYC to pwsYtqWGHRP43dB0EyLu7S9R3uGV0dIhulPbnSUDUmcC (flutter/engine#9848)

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