Reland "Add new latency_info for tracking browser composite time."

content/browser/renderer_host/render_widget_host_impl.h

 // Copyright (c) 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 CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 
 #include <deque>
 #include <list>
 #include <map>
@@ skipping 437 matching lines @@
     return max_size_for_auto_resize_;
   }
 
   void FrameSwapped(const ui::LatencyInfo& latency_info);
   void DidReceiveRendererFrame();
 
   // Returns the ID that uniquely describes this component to the latency
   // subsystem.
   int64 GetLatencyComponentId() const;
 
+  base::TimeDelta GetEstimatedBrowserCompositeTime() const;
+
   static void CompositorFrameDrawn(
       const std::vector<ui::LatencyInfo>& latency_info);
 
   // Don't check whether we expected a resize ack during layout tests.
   static void DisableResizeAckCheckForTesting();
 
   void WindowSnapshotAsyncCallback(
       int routing_id,
       int snapshot_id,
       gfx::Size snapshot_size,
@@ skipping 356 matching lines @@
   PendingSnapshotMap pending_browser_snapshots_;
 
   base::WeakPtrFactory<RenderWidgetHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_