b7d4278b4f
Isolate data may need to be deleted on the same thread where it was allocated. In particular, the task observer set up in the UIDartState ctor must be removed from the same message loop where it was added. The engine had been using the same DartIsolate object as the root isolate data and as the isolate group data. This object would be deleted when the isolate group was shut down. However, group shutdown may occur on a thread associated with a secondary isolate. When this happens, cleanup of any state tied to the root isolate's thread will fail. This change adds a DartIsolateGroupData object holding state that is common among all isolates in a group. DartIsolateGroupData can be deleted on any thread. See https://github.com/flutter/flutter/issues/45578
Flutter Engine
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