Create a new action triggered when a BeginMainFrame is not expected before vsync

third_party/WebKit/public/platform/scheduler/renderer/renderer_scheduler.h

Index: third_party/WebKit/public/platform/scheduler/renderer/renderer_scheduler.h
diff --git a/third_party/WebKit/public/platform/scheduler/renderer/renderer_scheduler.h b/third_party/WebKit/public/platform/scheduler/renderer/renderer_scheduler.h
index 85485f3548736b8d8ec3c9d87392767a4b36cfd1..e1949dbda70846e570b2287db0c9052f9bdbbca6 100644
--- a/third_party/WebKit/public/platform/scheduler/renderer/renderer_scheduler.h
+++ b/third_party/WebKit/public/platform/scheduler/renderer/renderer_scheduler.h
@@ -85,6 +85,12 @@ class BLINK_PLATFORM_EXPORT RendererScheduler : public ChildScheduler {
   // need to be drawn. Must be called from the main thread.
   virtual void BeginFrameNotExpectedSoon() = 0;
 
+  // Called to notify about the start of a period where main frames are not
+  // scheduled and so short idle work can be scheduled. This will precede
+  // BeginFrameNotExpectedSoon and is also called when the compositor is busy

[sunnyps, 2017/04/20 18:36:48]

nit: compositor may be busy

[Dan Elphick, 2017/04/26 16:31:44]

Done.

+  // but the main thread is not.
+  virtual void BeginMainFrameNotExpectedUntil(base::TimeTicks time) = 0;
+
   // Called to notify about the start of a new frame.  Must be called from the
   // main thread.
   virtual void WillBeginFrame(const cc::BeginFrameArgs& args) = 0;