Chromium -> Mojo roll.

cc/layers/layer.h

 // Copyright 2010 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 CC_LAYERS_LAYER_H_
 #define CC_LAYERS_LAYER_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 508 matching lines @@
   // this boolean, this is impossible to determine after the fact without
   // wastefully recomputing it. This is public for the time being so that it can
   // be accessed from CDP.
   bool has_render_surface() const {
     return has_render_surface_;
   }
 
   // Sets new frame timing requests for this layer.
   void SetFrameTimingRequests(const std::vector<FrameTimingRequest>& requests);
 
+  void DidBeginTracing();
+
  protected:
   friend class LayerImpl;
   friend class TreeSynchronizer;
   ~Layer() override;
 
   Layer();
 
   // These SetNeeds functions are in order of severity of update:
   //
   // Called when this layer has been modified in some way, but isn't sure
@@ skipping 185 matching lines @@
 
   std::vector<FrameTimingRequest> frame_timing_requests_;
   bool frame_timing_requests_dirty_;
 
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_H_