[exo]CompositorFrameSinkHolder calls WillDraw in DidReceiveCompositorFrameAck

components/exo/surface.h

 // Copyright 2015 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 COMPONENTS_EXO_SURFACE_H_
 #define COMPONENTS_EXO_SURFACE_H_
 
 #include <list>
 #include <memory>
 #include <set>
@@ skipping 173 matching lines @@
 
   // Surface does not own observers. It is the responsibility of the observer
   // to remove itself when it is done observing.
   void AddSurfaceObserver(SurfaceObserver* observer);
   void RemoveSurfaceObserver(SurfaceObserver* observer);
   bool HasSurfaceObserver(const SurfaceObserver* observer) const;
 
   // Returns a trace value representing the state of the surface.
   std::unique_ptr<base::trace_event::TracedValue> AsTracedValue() const;
 
-  // Call this to indicate that surface is being scheduled for a draw.
-  void WillDraw();
+  // Call this to indicate that the previous CompositorFrame is processed and
+  // the surface is being scheduled for a draw.
+  void DidReceiveCompositorFrameAck();
 
   // Called when the begin frame source has changed.
   void SetBeginFrameSource(cc::BeginFrameSource* begin_frame_source);
 
   // Check whether this Surface and its children need to create new cc::Surface
   // IDs for their contents next time they get new buffer contents.
   void CheckIfSurfaceHierarchyNeedsCommitToNewSurfaces();
 
   // Returns the active contents size.
   gfx::Size content_size() const { return content_size_; }
@@ skipping 192 matching lines @@
   cc::BeginFrameSource* begin_frame_source_ = nullptr;
   bool needs_begin_frame_ = false;
   cc::BeginFrameAck current_begin_frame_ack_;
 
   DISALLOW_COPY_AND_ASSIGN(Surface);
 };
 
 }  // namespace exo
 
 #endif  // COMPONENTS_EXO_SURFACE_H_