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Reland "Reduce app startup latency by initializing the engine on a separate thread (#166918 )" (#167519 )

This includes a fix for a race seen in
EmbedderTest.PlatformThreadIsolatesWithCustomPlatformTaskRunner

The implementaion of MergedPlatformUIThread::kMergeAfterLaunch required
changing the interface of the TaskObserverAdd/TaskObserverRemove
callbacks so that TaskObserverAdd returned the TaskQueueId where the
observer was added. That TaskQueueId would later be given to
TaskObserverRemove.

The original implementation of this PR updated the embedder library's
implementation of TaskObserverAdd to return TaskQueueId::kInvalid to
signal that the observer was not added. However, this conflicted with
the embedder's EmbedderTaskRunner, whose implementation of
GetTaskQueueId returns TaskQueueId::kInvalid as a placeholder.

This PR reverts the embedder's TaskObserverAdd/TaskObserverRemove to the
original implementation which adds the observer to the current thread's
message loop and does not call GetTaskQueueId.

See https://github.com/flutter/flutter/issues/167418

2025-04-22 16:36:21 +00:00

build

Add buildroot compatibility for HWASAN. (#167133 )

2025-04-15 00:56:07 +00:00

build_overrides

Remove the redirects from src/build_overrides to src/flutter/build_overrides (#162553 )

2025-02-10 19:21:57 +00:00

flutter

Reland "Reduce app startup latency by initializing the engine on a separate thread (#166918 )" (#167519 )

2025-04-22 16:36:21 +00:00

tools/dart

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