Add compositor support for the LatencyInfo.

cc/trees/layer_tree_host_impl.cc

 // Copyright 2011 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.
 
 #include "cc/trees/layer_tree_host_impl.h"
 
 #include <algorithm>
 
 #include "base/basictypes.h"
 #include "base/debug/trace_event.h"
@@ skipping 996 matching lines @@
         gfx::Vector2dF(0.f, top_controls_manager_->controls_top_offset());
     metadata.location_bar_content_translation =
         gfx::Vector2dF(0.f, top_controls_manager_->content_top_offset());
     metadata.overdraw_bottom_height = overdraw_bottom_height_;
   }
 
   if (!RootScrollLayer())
     return metadata;
 
   metadata.root_scroll_offset = RootScrollLayer()->TotalScrollOffset();
+  metadata.latency_info = latency_info_;
 
   return metadata;
 }
 
 bool LayerTreeHostImpl::AllowPartialSwap() const {
   // We don't track damage on the HUD layer (it interacts with damage tracking
   // visualizations), so disable partial swaps to make the HUD layer display
   // properly.
   return !debug_state_.ShowHudRects();
 }
@@ skipping 79 matching lines @@
   return renderer_ && renderer_->IsContextLost();
 }
 
 const RendererCapabilities& LayerTreeHostImpl::GetRendererCapabilities() const {
   return renderer_->Capabilities();
 }
 
 bool LayerTreeHostImpl::SwapBuffers(const LayerTreeHostImpl::FrameData& frame) {
   if (frame.has_no_damage)
     return false;
-  return renderer_->SwapBuffers();
+  bool result = renderer_->SwapBuffers(latency_info_);
+  latency_info_.Clear();
+  return result;
+}
+
+void LayerTreeHostImpl::SetLatencyInfo(const LatencyInfo& latency_info) {
+  latency_info_.MergeWith(latency_info);
 }
 
 void LayerTreeHostImpl::EnableVSyncNotification(bool enable) {
   if (output_surface_)
     output_surface_->EnableVSyncNotification(enable);
 }
 
 gfx::Size LayerTreeHostImpl::DeviceViewportSize() const {
   return device_viewport_size();
 }
@@ skipping 959 matching lines @@
 }
 
 void LayerTreeHostImpl::SetDebugState(const LayerTreeDebugState& debug_state) {
   if (debug_state_.continuous_painting != debug_state.continuous_painting)
     paint_time_counter_->ClearHistory();
 
   debug_state_ = debug_state;
 }
 
 }  // namespace cc