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- Add Dart_ShouldPauseOnStart, Dart_SetShouldPauseOnStart, Dart_IsPausedOnStart, Dart_SetPausedOnStart, Dart_ShouldPauseOnExit, Dart_SetShouldPauseOnExit, Dart_IsPausedOnExit, Dart_SetPausedOnExit to query and control pause on start / exit from outside of the default message handler. - Add Dart_HandleMessages to process all regular messages from outside the default message handler. - Allow per isolate overriding of pause on start / pause on exit flags. - Set the resume_request bit when resuming from isolate start / exit. - Clear the resume_request bit in the default message handler. - Rename MessageHandler fields and accessors. - Rename Isolate::Resume to Isolate::SetResumeRequest. R=turnidge@google.com Review URL: https://codereview.chromium.org/1665773004 .