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

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

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef THIRD_PARTY_WEBKIT_PUBLIC_PLATFORM_SCHEDULER_RENDERER_RENDERER_SCHEDULER_H_
 #define THIRD_PARTY_WEBKIT_PUBLIC_PLATFORM_SCHEDULER_RENDERER_RENDERER_SCHEDULER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 67 matching lines @@
 
   // Returns a new RenderWidgetSchedulingState.  The signals from this will be
   // used to make scheduling decisions.
   virtual std::unique_ptr<RenderWidgetSchedulingState>
   NewRenderWidgetSchedulingState() = 0;
 
   // Called to notify about the start of an extended period where no frames
   // 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;
 
   // Called to notify that a previously begun frame was committed. Must be
   // called from the main thread.
   virtual void DidCommitFrameToCompositor() = 0;
 
   // Keep RendererScheduler::InputEventStateToString in sync with this enum.
   enum class InputEventState {
@@ skipping 98 matching lines @@
 
  protected:
   RendererScheduler();
   DISALLOW_COPY_AND_ASSIGN(RendererScheduler);
 };
 
 }  // namespace scheduler
 }  // namespace blink
 
 #endif  // THIRD_PARTY_WEBKIT_PUBLIC_PLATFORM_SCHEDULER_RENDERER_RENDERER_SCHEDULER_H_