* b08c6b95e Fixing synthesizing keys for multiple keys pressed down on flutter web (flutter/engine#19632)

* 8308b6ad8 Avoid passing nil to IOS accessibility announcement  (flutter/engine#20700)

* 950b6a030 Roll Skia from ead4ca052b99 to 5da7327358e3 (1 revision) (flutter/engine#20782)

* 87fd0e497 Guard recording_canvas against restore calls without ending recording (flutter/engine#20786)

* 388193a67 Add tests for lerpDouble (flutter/engine#20778)

* Use a LinkedList in ChangeNotifier implementation to take O(N^2) notification time to O(N)

Revert "Reland: Increase threshold for usage of compute for utf8 decoding on large strings to 50 KB (#64498)" (#64652)

This reverts commit 54e2a0e6.

* Use Pixel4 for better wait times

According to the firebase team, these have lower wait times for tests.

Revert "[flutter_tools] avoid creating Android Devices if AndroidSDK cannot be found (#64524)" (#64602)

This reverts commit 47596c62.

To allow tests to begin migrating to null safety, sound null safety needs to be disabled. Also removes the experiment flag that is unnecessary since the framework is on the SDK allowlist.

Added instructions on how to regenerate certificate too.

This reverts commit 0ab5ecc8.

Avoid creating AndroidDevice discovery if the SDK cannot be located. Previously the tool would use which/where adb, however this required us to handle the AndroidSdk class being potentially null - which required an additional layer of indirection around all access. Sometimes these were forgotten leading to NPEs.

In general, not much can be done with an Android Device if the actual SDK is not installed.

Fixes #64246

If decoding the string contents of a stamp file fails, treat it as if the stamp file is missing. This is always safe to do, since at worst it downloads more artifacts. The files could end up corrupted if they were edited by another program, for example

[flutter_tools] support code size tooling on iOS, linux, windows, macOS, and Android on Windows (#63610)

Adds support for size analysis on iOS, macOS, linux, and Windows - using an uncompressed directory based approach. The output format is not currently specified.

Adds support for size analysis on android on windows, switching to package:archive

Updates the console format to display as a tree, allowing longer paths. Increases the number of dart libraries shown (to avoid only ever printing the flutter/dart:ui libraries, which dominate the size)

The pointer-argument-based version of Success() is deprecated; this
updates the template to use the new reference-based version (which
allows for inline construction of the response value).

Part of https://github.com/flutter/flutter/issues/63975

Reland: Increase threshold for usage of compute for utf8 decoding on large strings to 50 KB (#64498)