Add Keyboard Latency UMA Metrics.

content/browser/frame_host/render_widget_host_view_child_frame.h

 // Copyright 2014 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_FRAME_HOST_RENDER_WIDGET_HOST_VIEW_CHILD_FRAME_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_WIDGET_HOST_VIEW_CHILD_FRAME_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 101 matching lines @@
   void OnBeginFrameDidNotSwap(const cc::BeginFrameAck& ack) override;
   // Since the URL of content rendered by this class is not displayed in
   // the URL bar, this method does not need an implementation.
   void ClearCompositorFrame() override {}
   gfx::Rect GetBoundsInRootWindow() override;
   void ProcessAckedTouchEvent(const TouchEventWithLatencyInfo& touch,
                               InputEventAckState ack_result) override;
   bool LockMouse() override;
   void UnlockMouse() override;
   cc::FrameSinkId GetFrameSinkId() override;
-  void ProcessKeyboardEvent(const NativeWebKeyboardEvent& event) override;
+  void ProcessKeyboardEvent(const NativeWebKeyboardEvent& event,
+                            const ui::LatencyInfo& latency) override;
   void ProcessMouseEvent(const blink::WebMouseEvent& event,
                          const ui::LatencyInfo& latency) override;
   void ProcessMouseWheelEvent(const blink::WebMouseWheelEvent& event,
                               const ui::LatencyInfo& latency) override;
   void ProcessTouchEvent(const blink::WebTouchEvent& event,
                          const ui::LatencyInfo& latency) override;
   void ProcessGestureEvent(const blink::WebGestureEvent& event,
                            const ui::LatencyInfo& latency) override;
   gfx::Point TransformPointToRootCoordSpace(const gfx::Point& point) override;
   bool TransformPointToLocalCoordSpace(const gfx::Point& point,
@@ skipping 122 matching lines @@
 
   bool has_frame_ = false;
 
   base::WeakPtrFactory<RenderWidgetHostViewChildFrame> weak_factory_;
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewChildFrame);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_WIDGET_HOST_VIEW_CHILD_FRAME_H_