Add Keyboard Latency UMA Metrics.

content/browser/renderer_host/render_widget_host_view_base.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_BASE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_BASE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 246 matching lines @@
 
   // When there are multiple RenderWidgetHostViews for a single page, input
   // events need to be targeted to the correct one for handling. The following
   // methods are invoked on the RenderWidgetHostView that should be able to
   // properly handle the event (i.e. it has focus for keyboard events, or has
   // been identified by hit testing mouse, touch or gesture events).
   virtual cc::FrameSinkId FrameSinkIdAtPoint(
       cc::SurfaceHittestDelegate* delegate,
       const gfx::Point& point,
       gfx::Point* transformed_point);
-  virtual void ProcessKeyboardEvent(const NativeWebKeyboardEvent& event) {}
+  virtual void ProcessKeyboardEvent(const NativeWebKeyboardEvent& event,
+                                    const ui::LatencyInfo& latency) {}
   virtual void ProcessMouseEvent(const blink::WebMouseEvent& event,
                                  const ui::LatencyInfo& latency) {}
   virtual void ProcessMouseWheelEvent(const blink::WebMouseWheelEvent& event,
                                       const ui::LatencyInfo& latency) {}
   virtual void ProcessTouchEvent(const blink::WebTouchEvent& event,
                                  const ui::LatencyInfo& latency) {}
   virtual void ProcessGestureEvent(const blink::WebGestureEvent& event,
                                    const ui::LatencyInfo& latency) {}
 
   // Transform a point that is in the coordinate space of a Surface that is
@@ skipping 189 matching lines @@
   base::ObserverList<RenderWidgetHostViewBaseObserver> observers_;
 
   base::WeakPtrFactory<RenderWidgetHostViewBase> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewBase);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_BASE_H_