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 b94f121ae0d1775eeef0d35277f3c6d4ba22a848..dcb2f7eac7db4bb87bb6f21ef5791d8bb82b3159 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 <array>

[alex clarke (OOO till 29th), 2016/11/14 17:00:17]

Is this needed?

[tdresser, 2016/12/15 13:17:00]

Done.

+
 namespace blink {
 namespace scheduler {
 
@@ -27,20 +29,31 @@ class BLINK_PLATFORM_EXPORT QueueingTimeEstimator {
     DISALLOW_COPY_AND_ASSIGN(Client);
   };
 
+  struct Data {
+    base::TimeDelta current_expected_queueing_time;
+    base::TimeDelta window_duration;
+    base::TimeTicks window_start_time;
+    base::TimeTicks current_task_start_time;
+  };
+
   QueueingTimeEstimator(Client* client, base::TimeDelta window_duration);
+  explicit QueueingTimeEstimator(const Data& data);
 
-  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);
+
+  // Returns all state except for the current |client_|.
+  Data data() const { return data_; }

[Sami, 2016/11/14 21:16:45]

nit: I would make this return a const Data& and have the client be responsible
for copying the struct.

[tdresser, 2016/12/15 13:17:00]

Done.

+
+  base::TimeDelta EstimateQueueingTimeIncludingCurrentTask(
+      base::TimeTicks now) const;
 
  private:
   bool TimePastWindowEnd(base::TimeTicks task_end_time);
   Client* client_;  // NOT OWNED.
+  Data data_;
 
-  base::TimeDelta current_expected_queueing_time_;
-  base::TimeDelta window_duration_;
-  base::TimeTicks window_start_time_;
-
-  DISALLOW_COPY_AND_ASSIGN(QueueingTimeEstimator);
+  DISALLOW_ASSIGN(QueueingTimeEstimator);
 };
 
 }  // namespace scheduler