Cherry-pick https://github.com/flutter/engine/pull/9717

Cherry-pick the following PRs onto v1.7.8-hotfixes to prepare for release.

https://github.com/flutter/engine/pull/9581
https://github.com/flutter/engine/pull/9464
https://github.com/flutter/flutter/pull/35221

https://github.com/flutter/engine/compare/fa16babc4537...d004bcd4d619

git log fa16babc4537967c065605e4e184b206869da1f6..d004bcd4d619fc3574761d63d7cf7b7291332c79 --no-merges --oneline
d004bcd4d Revert "Reland Update harfbuzz to 2.5.2 (#9406)" (flutter/engine#9437)
264d6d578 Reland Update harfbuzz to 2.5.2 (flutter/engine#9406)
f6389583f Ios unit tests choose engine (flutter/engine#9432)
8f20c1bd5 Roll src/third_party/skia 893403fb3896..f3881b278e69 (9 commits) (flutter/engine#9434)
6d2d9c88f Resolves embedding log chattyness by gating verbose, debug, and info logs by level (#34876). (flutter/engine#9425)

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https://github.com/flutter/engine/compare/e32307e9f140...fa16babc4537

git log e32307e9f1409c9f0518956d9c695c1105565201..fa16babc4537967c065605e4e184b206869da1f6 --no-merges --oneline
fa16babc4 Use goma-aware Fuchsia clang toolchain (flutter/engine#9430)

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https://github.com/flutter/engine/compare/a9a0b89b1c82...e32307e9f140

git log a9a0b89b1c82aa657708eece3e690bf39cf0ead5..e32307e9f1409c9f0518956d9c695c1105565201 --no-merges --oneline
e32307e9f Revert "Update harfbuzz to 2.5.2 (#9406)" (flutter/engine#9429)
780343a22 Update harfbuzz to 2.5.2 (flutter/engine#9406)
3757f1992 delegate checkInputConnectionProxy to the relevant platform view (flutter/engine#9426)
d9dfad3b8 Roll src/third_party/skia 8676929c0a13..893403fb3896 (6 commits) (flutter/engine#9421)
91e31dca5 Made the license check ignore the .vscode directory. (flutter/engine#9398)
24c3f513f Roll src/third_party/skia a1d26a807798..8676929c0a13 (9 commits) (flutter/engine#9416)
e33f83edb Roll src/third_party/skia e3beb99f39f0..a1d26a807798 (1 commits) (flutter/engine#9411)

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* Prepare for HttpClientResponse Uint8List SDK change

An upcoming change in the Dart SDK will change `HttpClientResponse`
from implementing `Stream<List<int>>` to instead implement
`Stream<Uint8List>`.

This forwards-compatible change to `_MockHttpClientResponse` is being
made to allow for a smooth rollout of that SDK breaking change. The
current structure of the class is as follows:

```dart
_MockHttpClientResponse extends Stream<List<int>> implements HttpClientResponse {
  ...
}
```

This structure would require that the Dart SDK change land atomically
a change to the class (`extends Stream<Uint8List>`). This atomic landing
requirement doesn't play well at all with Flutter's roll model vis-a-vis
the Dart SDK's roll model to Google's internal repo.  As such, this commit
changes the structure of `_MockHttpClientResponse` to be:

```dart
_MockHttpClientResponse implements HttpClientResponse {
  final Stream<Uint8List> _delegate;

  ...
}
```

Once the Dart SDK change has fully rolled out, we can simplify this class
back to its former structure.

https://github.com/dart-lang/sdk/issues/36900

* Review comment

Change the way outlined inputs vertically align their text to be more similar to how it used to be before a refactor. Fixes an edge case uncovered by a SCUBA test.

a9a0b89b1 Roll src/third_party/skia 5549cb00a2cf..e3beb99f39f0 (4 commits) (flutter/engine#9410) (#34845)


https://github.com/flutter/engine/compare/9c5d08fc7746...a9a0b89b1c82

git log 9c5d08fc7746e7f263439719230c24bdcfffb11e..a9a0b89b1c82aa657708eece3e690bf39cf0ead5 --no-merges --oneline
a9a0b89b1 Roll src/third_party/skia 5549cb00a2cf..e3beb99f39f0 (4 commits) (flutter/engine#9410)

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9c5d08fc7 Roll src/third_party/skia 0c64a545176a..5549cb00a2cf (1 commits) (flutter/engine#9408) (#34832)


https://github.com/flutter/engine/compare/950d4813b5c6...9c5d08fc7746

git log 950d4813b5c6806a01f0225da814f5cb300dd65b..9c5d08fc7746e7f263439719230c24bdcfffb11e --no-merges --oneline
9c5d08fc7 Roll src/third_party/skia 0c64a545176a..5549cb00a2cf (1 commits) (flutter/engine#9408)

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https://github.com/flutter/engine/compare/cd973f8aaeae...950d4813b5c6

git log cd973f8aaeae624feab3288b1d85a1770115909b..950d4813b5c6806a01f0225da814f5cb300dd65b --no-merges --oneline
950d4813b Clamp when overflowing z bounds (flutter/engine#9402)

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https://github.com/flutter/engine/compare/0c874c62d0ad...cd973f8aaeae

git log 0c874c62d0ad596484a83afaa5a6c546d96679fc..cd973f8aaeae624feab3288b1d85a1770115909b --no-merges --oneline
cd973f8aa Added unit tests for the ios code. (flutter/engine#9388)
a2db2ea6f Android Embedding Refactor PR35: Ensure all JNI methods are in FlutterJNI (#34751). (flutter/engine#9391)

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https://github.com/flutter/engine/compare/3b52992902ee...0c874c62d0ad

git log 3b52992902eee1a4e629b693fc82ccb357e5fa44..0c874c62d0ad596484a83afaa5a6c546d96679fc --no-merges --oneline
0c874c62d Avoid a full screen overlay within virtual displays (flutter/engine#9343)
605c63be9 Roll src/third_party/skia 384981be3dd2..0c64a545176a (11 commits) (flutter/engine#9404)
7a5ec8d79 Remove build flags for dynamic patching (flutter/engine#9394)

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https://github.com/flutter/engine/compare/14c3c79f573d...3b52992902ee

git log 14c3c79f573dc35fb9e497ab5cedc5e12716d9e9..3b52992902eee1a4e629b693fc82ccb357e5fa44 --no-merges --oneline
3b5299290 Roll src/third_party/skia 4918bbcbfd54..384981be3dd2 (13 commits) (flutter/engine#9395)
7fc828d1a Workaround fix the platform view dismiss crash related to gl (flutter/engine#9377)

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https://github.com/flutter/engine/compare/a82751503fa6...14c3c79f573d

git log a82751503fa6f910042bc04020bd43756a96903d..14c3c79f573dc35fb9e497ab5cedc5e12716d9e9 --no-merges --oneline
14c3c79f5 libtxt: remove obsolete font_manager_available defines (flutter/engine#9376)
e6d355221 [glfw] Implement SystemNavigator.pop (flutter/engine#9365)
9b130a4bf Roll src/third_party/skia b520476ee6dc..4918bbcbfd54 (4 commits) (flutter/engine#9393)

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* Added some Widgets of the Week to documentation: AspectRatio and AnimatedIcon.

Breaking change to extremely rarely used ParentDataWidget.debugDescribeInvalidAncestorChain api changing the return type of the method from String to DiagnosticsNode.

a82751503 Roll src/third_party/skia e08b443f9bda..b520476ee6dc (5 commits) (flutter/engine#9392) (#34793)


https://github.com/flutter/engine/compare/3bcd6a8f7b36...a82751503fa6

git log 3bcd6a8f7b360cbdfe527b5e21eaca108c24f31f..a82751503fa6f910042bc04020bd43756a96903d --no-merges --oneline
a82751503 Roll src/third_party/skia e08b443f9bda..b520476ee6dc (5 commits) (flutter/engine#9392)

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3bcd6a8f7 Android Embedding Refactor PR34: Fill in missing nullability annotations. (flutter/engine#9384) (#34776)


https://github.com/flutter/engine/compare/e8e9ba29cff1...3bcd6a8f7b36

git log e8e9ba29cff1b233b795435480b5137183ab4887..3bcd6a8f7b360cbdfe527b5e21eaca108c24f31f --no-merges --oneline
3bcd6a8f7 Android Embedding Refactor PR34: Fill in missing nullability annotations. (flutter/engine#9384)

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* Custom dataRowHeight for DataTable and PaginatedDataTable

* Custom headingRowHeight for DataTable and PaginatedDataTable

e8e9ba29c Roll src/third_party/skia 0233b1edf242..e08b443f9bda (1 commits) (flutter/engine#9387) (#34762)


https://github.com/flutter/engine/compare/63d5f015dd92...e8e9ba29cff1

git log 63d5f015dd92ba6921652947b42bf43b4e8b43f9..e8e9ba29cff1b233b795435480b5137183ab4887 --no-merges --oneline
e8e9ba29c Roll src/third_party/skia 0233b1edf242..e08b443f9bda (1 commits) (flutter/engine#9387)

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This reverts commit 3ca76098.

https://github.com/flutter/engine/compare/7c4f6a68302f...63d5f015dd92

git log 7c4f6a68302fe3d51f82e40e2e145aead673e20f..63d5f015dd92ba6921652947b42bf43b4e8b43f9 --no-merges --oneline
63d5f015d Add Dart SDK > 2.3.0 constraint to license script (flutter/engine#9385)
ece4f5937 Update Metal backend to account for Skia updates. (flutter/engine#9383)
c187e5068 Roll Dart to version 7340a569caac6431d8698dc3788579b57ffcf0c6 (flutter/engine#9374)
b70bc3b8e Roll src/third_party/skia 01c9b89a8520..0233b1edf242 (13 commits) (flutter/engine#9382)
a632b781e Message loop task heaps are shared (flutter/engine#9335)

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https://github.com/flutter/engine/compare/54f88ab5da4d...7c4f6a68302f

git log 54f88ab5da4d0f3cff5337ab263dbf3385ee78df..7c4f6a68302fe3d51f82e40e2e145aead673e20f --no-merges --oneline
7c4f6a683 Wire intent args for observatory port (flutter/engine#9378)

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This reverts commit f221ad1f.