Force events to be non blocking if main thread is unresponsive.

third_party/WebKit/Source/platform/scheduler/test/fake_renderer_scheduler.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "public/platform/scheduler/test/fake_renderer_scheduler.h"
 
 #include "public/platform/WebThread.h"
 
 namespace blink {
 namespace scheduler {
@@ skipping 103 matching lines @@
 void FakeRendererScheduler::ResumeTimerQueue() {}
 
 void FakeRendererScheduler::SetTimerQueueSuspensionWhenBackgroundedEnabled(
     bool enabled) {}
 
 void FakeRendererScheduler::SetTopLevelBlameContext(
     base::trace_event::BlameContext* blame_context) {}
 
 void FakeRendererScheduler::SetRAILModeObserver(RAILModeObserver* observer) {}
 
+bool FakeRendererScheduler::MainThreadSeemsUnresponsive() {
+  return false;
+}
+
 }  // namespace scheduler
 }  // namespace blink