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..6cc657cdaace54a86e12ba9fb5e9c529ba68aff1 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 +9,9 @@
 #include "base/time/time.h"
 #include "public/platform/WebCommon.h"
 
+#include <array>
+#include <memory>
+
 namespace base {
 class TickClock;
 }
@@ -31,10 +34,19 @@ class BLINK_PLATFORM_EXPORT QueueingTimeEstimator {
     DISALLOW_COPY_AND_ASSIGN(Client);
   };
 
+  using SerializedQueueingTimeEstimator = std::array<int64_t, 4>;

[Sami, 2016/11/03 16:43:15]

Could this be a normal struct instead? That way we could have names for the
items and it would generally be more obvious what's going on. We could also make
it a member of the live class to reduce duplication. (TimeTicks/Delta don't have
vtables or pointers so they are safe to pass through the shared buffer.)

+
   QueueingTimeEstimator(Client* client, base::TimeDelta window_duration);
+  explicit QueueingTimeEstimator(
+      SerializedQueueingTimeEstimator serialized_queueing_time_estimator);
+
+  void OnTopLevelTaskStarted(base::TimeTicks task_start_time);
+  void OnTopLevelTaskCompleted(base::TimeTicks task_end_time);
+
+  SerializedQueueingTimeEstimator Serialize() const;
 
-  void OnToplevelTaskCompleted(base::TimeTicks task_start_time,
-                               base::TimeTicks task_end_time);
+  base::TimeDelta EstimateQueueingTimeIncludingCurrentTask(
+      base::TimeTicks now) const;
 
  private:
   bool TimePastWindowEnd(base::TimeTicks task_end_time);
@@ -43,8 +55,9 @@ 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