Add UMA/Telemetry stats for touch event latency

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 480 matching lines @@
   void SetOverscrollControllerEnabled(bool enabled);
 
   // Suppreses future char events until a keydown. See
   // suppress_next_char_events_.
   void SuppressNextCharEvents();
 
   // Indicates whether the renderer drives the RenderWidgetHosts's size or the
   // other way around.
   bool should_auto_resize() { return should_auto_resize_; }
 
+  void ComputeTouchLatency(const ui::LatencyInfo& latency_info);
   void FrameSwapped(const ui::LatencyInfo& latency_info);
 
   // Returns the ID that uniquely describes this component to the latency
   // subsystem.
   int64 GetLatencyComponentId();
 
   static void CompositorFrameDrawn(const ui::LatencyInfo& latency_info);
 
   // Don't check whether we expected a resize ack during layout tests.
   static void DisableResizeAckCheckForTesting();
@@ skipping 430 matching lines @@
   int64 last_input_number_;
 
   BrowserRenderingStats rendering_stats_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_