Add Keyboard Latency UMA Metrics.

content/browser/renderer_host/render_widget_host_view_event_handler.h

Index: content/browser/renderer_host/render_widget_host_view_event_handler.h
diff --git a/content/browser/renderer_host/render_widget_host_view_event_handler.h b/content/browser/renderer_host/render_widget_host_view_event_handler.h
index 8f80ee7f4e049067980dec57a587c14da01b21df..acf533124c4258fe19afabedf28c855408931c63 100644
--- a/content/browser/renderer_host/render_widget_host_view_event_handler.h
+++ b/content/browser/renderer_host/render_widget_host_view_event_handler.h
@@ -62,8 +62,10 @@ class CONTENT_EXPORT RenderWidgetHostViewEventHandler
     // to the renderer instead. |update_event| (if non-null) is set to indicate
     // whether ui::KeyEvent::SetHandled() should be called on the underlying
     // ui::KeyEvent.
-    virtual void ForwardKeyboardEvent(const NativeWebKeyboardEvent& event,
-                                      bool* update_event) = 0;
+    virtual void ForwardKeyboardEventWithLatencyInfo(
+        const NativeWebKeyboardEvent& event,
+        const ui::LatencyInfo& latency,
+        bool* update_event) = 0;
     // Returns whether the widget needs to grab mouse capture to work properly.
     virtual bool NeedsMouseCapture() = 0;
     virtual void SetTooltipsEnabled(bool enable) = 0;