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

third_party/WebKit/Source/platform/scheduler/base/queueing_time_estimator.h

Index: third_party/WebKit/Source/platform/scheduler/base/queueing_time_estimator.h
diff --git a/third_party/WebKit/Source/platform/scheduler/base/queueing_time_estimator.h b/third_party/WebKit/Source/platform/scheduler/base/queueing_time_estimator.h
index 21db2557f17485ea8c0dc6347c5ab92914f6d7b4..13d69667676aaed697dc97e104ad181ee05e6a9b 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/queueing_time_estimator.h
+++ b/third_party/WebKit/Source/platform/scheduler/base/queueing_time_estimator.h
@@ -9,6 +9,8 @@
 #include "base/time/time.h"
 #include "public/platform/WebCommon.h"
 
+#include <memory>
+
 namespace base {
 class TickClock;
 }
@@ -33,8 +35,12 @@ class BLINK_PLATFORM_EXPORT QueueingTimeEstimator {
 
   QueueingTimeEstimator(Client* client, base::TimeDelta window_duration);
 
-  void OnToplevelTaskCompleted(base::TimeTicks task_start_time,
-                               base::TimeTicks task_end_time);
+  void OnTopLevelTaskStarted(base::TimeTicks task_start_time);
+  void OnTopLevelTaskCompleted(base::TimeTicks task_end_time);
+
+  base::TimeDelta EstimateQueueingTimeIncludingCurrentTask(
+      base::TimeTicks now) const;
+  QueueingTimeEstimator(const QueueingTimeEstimator& queueing_time_estimator);
 
  private:
   bool TimePastWindowEnd(base::TimeTicks task_end_time);
@@ -43,8 +49,9 @@ class BLINK_PLATFORM_EXPORT QueueingTimeEstimator {
   base::TimeDelta current_expected_queueing_time_;
   base::TimeDelta window_duration_;
   base::TimeTicks window_start_time_;
+  base::TimeTicks current_task_start_time_;
 
-  DISALLOW_COPY_AND_ASSIGN(QueueingTimeEstimator);
+  DISALLOW_ASSIGN(QueueingTimeEstimator);
 };
 
 }  // namespace scheduler