Record PendingTaskCount when a backgrounded renderer is suspended.

third_party/WebKit/Source/platform/scheduler/child/idle_helper.h

Index: third_party/WebKit/Source/platform/scheduler/child/idle_helper.h
diff --git a/third_party/WebKit/Source/platform/scheduler/child/idle_helper.h b/third_party/WebKit/Source/platform/scheduler/child/idle_helper.h
index 5cf7199f90084b38de7d92eea4f7482754818e96..353a0667001e0e07c4f4ce83166304334dd528f1 100644
--- a/third_party/WebKit/Source/platform/scheduler/child/idle_helper.h
+++ b/third_party/WebKit/Source/platform/scheduler/child/idle_helper.h
@@ -143,6 +143,8 @@ class BLINK_PLATFORM_EXPORT IdleHelper
   IdlePeriodState SchedulerIdlePeriodState() const;
   static const char* IdlePeriodStateToString(IdlePeriodState state);
 
+  int GetNumberOfPendingIdleTasks();

[Sami, 2016/10/14 01:38:18]

size_t

[tasak, 2016/10/14 05:55:31]

I agree. 
...so I found that we don't need this method. Because I added
GetNumberOfPendingTasks to TaskQueueManager (and also SchedulerHelper).

+
  private:
   friend class BaseIdleHelperTest;
   friend class IdleHelperTest;