Track AsyncReadback time using histogram.

content/browser/renderer_host/render_widget_host_view_android.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_VIEW_ANDROID_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_
 
 #include <map>
 #include <queue>
 
@@ skipping 257 matching lines @@
   void AttachLayers();
   void RemoveLayers();
 
   void UpdateAnimationSize(const cc::CompositorFrameMetadata& frame_metadata);
 
   // Called after async screenshot task completes. Scales and crops the result
   // of the copy.
   static void PrepareTextureCopyOutputResult(
       const gfx::Size& dst_size_in_pixel,
       bool readback_config_rgb565,
+      const base::TimeTicks& start_time,
       const base::Callback<void(bool, const SkBitmap&)>& callback,
       scoped_ptr<cc::CopyOutputResult> result);
   static void PrepareBitmapCopyOutputResult(
       const gfx::Size& dst_size_in_pixel,
+      const base::TimeTicks& start_time,
       const base::Callback<void(bool, const SkBitmap&)>& callback,
       scoped_ptr<cc::CopyOutputResult> result);
 
   // DevTools ScreenCast support for Android WebView.
   void SynchronousCopyContents(
       const gfx::Rect& src_subrect_in_pixel,
       const gfx::Size& dst_size_in_pixel,
       const base::Callback<void(bool, const SkBitmap&)>& callback);
 
   // The model object.
@@ skipping 62 matching lines @@
   const bool using_synchronous_compositor_;
 
   scoped_ptr<DelegatedFrameEvictor> frame_evictor_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAndroid);
 };
 
 } // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_