Carlo Bernaschina e7cd520490 Add waitUIThreadIdle service RPC (flutter/engine#3898)
In https://github.com/flutter/engine/pull/3833 the `_flutter.listViews` RPC moved from thread based to lock based synchronization.
The thread based synchronization side effect was used by flutter benchmarks in https://github.com/flutter/flutter/blob/master/packages/flutter_tools/lib/src/vmservice.dart#L1223 and
https://github.com/flutter/flutter/blob/master/packages/flutter_tools/lib/src/run_hot.dart#L156 to ensure the completeness of the restart/reload and so correct timing.

A new RPC `_flutter.flushUIThreadTasks` is introduced to allow the flutter benchmarks to reintroduce thread based synchronization.

Related https://github.com/flutter/flutter/issues/11241
2017-07-19 15:48:32 -07:00
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