Add compositor support for the LatencyInfo.

cc/trees/layer_tree_impl.h

 // Copyright 2012 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_TREES_LAYER_TREE_IMPL_H_
 #define CC_TREES_LAYER_TREE_IMPL_H_
 
 #include <string>
 #include <vector>
 
 #include "base/hash_tables.h"
 #include "base/values.h"
+#include "cc/debug/latency_info.h"
 #include "cc/layers/layer_impl.h"
 
 #if defined(COMPILER_GCC)
 namespace BASE_HASH_NAMESPACE {
 template<>
 struct hash<cc::LayerImpl*> {
   size_t operator()(cc::LayerImpl* ptr) const {
     return hash<size_t>()(reinterpret_cast<size_t>(ptr));
   }
 };
@@ skipping 167 matching lines @@
   // Useful for debug assertions, probably shouldn't be used for anything else.
   Proxy* proxy() const;
 
   void SetPinchZoomHorizontalLayerId(int layer_id);
   void SetPinchZoomVerticalLayerId(int layer_id);
 
   void DidBeginScroll();
   void DidUpdateScroll();
   void DidEndScroll();
 
+  void SetLatencyInfo(const LatencyInfo& latency_info);
+  const LatencyInfo& GetLatencyInfo();
+  void ClearLatencyInfo();
+
  protected:
   explicit LayerTreeImpl(LayerTreeHostImpl* layer_tree_host_impl);
 
   void UpdateSolidColorScrollbars();
 
   // Hide existence of pinch-zoom scrollbars.
   void UpdatePinchZoomScrollbars();
   void FadeInPinchZoomScrollbars();
   void FadeOutPinchZoomScrollbars();
   ScrollbarLayerImpl* PinchZoomScrollbarHorizontal();
@@ skipping 31 matching lines @@
   LayerImplList render_surface_layer_list_;
 
   bool contents_textures_purged_;
   bool viewport_size_invalid_;
   bool needs_update_draw_properties_;
 
   // In impl-side painting mode, this is true when the tree may contain
   // structural differences relative to the active tree.
   bool needs_full_tree_sync_;
 
+  LatencyInfo latency_info_;
+
   DISALLOW_COPY_AND_ASSIGN(LayerTreeImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_IMPL_H_