cc: Post the missed BeginFrame to a new stack

cc/surfaces/display_scheduler.h

Index: cc/surfaces/display_scheduler.h
diff --git a/cc/surfaces/display_scheduler.h b/cc/surfaces/display_scheduler.h
index 16d086814225dd2d78e027bfbb6067437ad572de..84f8ba4f7ba6fa25368ebeb2361719bcfa2304c7 100644
--- a/cc/surfaces/display_scheduler.h
+++ b/cc/surfaces/display_scheduler.h
@@ -68,6 +68,9 @@ class CC_SURFACES_EXPORT DisplayScheduler : public BeginFrameObserverBase {
   base::CancelableClosure begin_frame_deadline_task_;
   base::TimeTicks begin_frame_deadline_task_time_;
 
+  base::CancelableClosure missed_begin_frame_task_;
+  bool inside_external_action_ = false;

[sunnyps, 2016/07/27 05:21:02]

nit: can you follow existing style here i.e. initializing this in the ctor?

[danakj, 2016/07/27 22:34:55]

Done.

+
   bool output_surface_lost_;
   bool root_surface_resources_locked_;