Log First User Interaction in Page Load Metrics

content/browser/renderer_host/render_widget_host_impl.h

Index: content/browser/renderer_host/render_widget_host_impl.h
diff --git a/content/browser/renderer_host/render_widget_host_impl.h b/content/browser/renderer_host/render_widget_host_impl.h
index 674e463ce8a3e35e721d5f0bf2ea16067304c01b..de4eec34a06392914d04d31783daa6670fbbe47b 100644
--- a/content/browser/renderer_host/render_widget_host_impl.h
+++ b/content/browser/renderer_host/render_widget_host_impl.h
@@ -169,6 +169,10 @@ class CONTENT_EXPORT RenderWidgetHostImpl : public RenderWidgetHost,
       const KeyPressEventCallback& callback) override;
   void AddMouseEventCallback(const MouseEventCallback& callback) override;
   void RemoveMouseEventCallback(const MouseEventCallback& callback) override;
+  void AddInputEventObserver(
+      RenderWidgetHost::InputEventObserver* observer) override;
+  void RemoveInputEventObserver(
+      RenderWidgetHost::InputEventObserver* observer) override;
   void GetWebScreenInfo(blink::WebScreenInfo* result) override;
   bool GetScreenColorProfile(std::vector<char>* color_profile) override;
   void HandleCompositorProto(const std::vector<uint8_t>& proto) override;
@@ -296,19 +300,17 @@ class CONTENT_EXPORT RenderWidgetHostImpl : public RenderWidgetHost,
   void ForwardGestureEventWithLatencyInfo(
       const blink::WebGestureEvent& gesture_event,
       const ui::LatencyInfo& ui_latency) override;
-  void ForwardTouchEventWithLatencyInfo(
-      const blink::WebTouchEvent& touch_event,
-      const ui::LatencyInfo& ui_latency);
-  void ForwardMouseEventWithLatencyInfo(
-      const blink::WebMouseEvent& mouse_event,
-      const ui::LatencyInfo& ui_latency);
+  void ForwardTouchEventWithLatencyInfo(const blink::WebTouchEvent& touch_event,
+                                        const ui::LatencyInfo& ui_latency);
+  void ForwardMouseEventWithLatencyInfo(const blink::WebMouseEvent& mouse_event,
+                                        const ui::LatencyInfo& ui_latency);
   virtual void ForwardWheelEventWithLatencyInfo(
       const blink::WebMouseWheelEvent& wheel_event,
-      const ui::LatencyInfo& ui_latency); // Virtual for testing.
+      const ui::LatencyInfo& ui_latency);  // Virtual for testing.
 
   // Enables/disables touch emulation using mouse event. See TouchEmulator.
-  void SetTouchEventEmulationEnabled(
-      bool enabled, ui::GestureProviderConfigType config_type);
+  void SetTouchEventEmulationEnabled(bool enabled,
+                                     ui::GestureProviderConfigType config_type);
 
   // TouchEmulatorClient implementation.
   void ForwardEmulatedGestureEvent(
@@ -361,9 +363,7 @@ class CONTENT_EXPORT RenderWidgetHostImpl : public RenderWidgetHost,
   // Cancels an ongoing composition.
   void ImeCancelComposition();
 
-  bool ignore_input_events() const {
-    return ignore_input_events_;
-  }
+  bool ignore_input_events() const { return ignore_input_events_; }
 
   // Whether forwarded WebInputEvents should be dropped.
   bool ShouldDropInputEvents() const;
@@ -375,12 +375,10 @@ class CONTENT_EXPORT RenderWidgetHostImpl : public RenderWidgetHost,
 
   // Notifies the renderer that the next key event is bound to one or more
   // pre-defined edit commands
-  void SetEditCommandsForNextKeyEvent(
-      const std::vector<EditCommand>& commands);
+  void SetEditCommandsForNextKeyEvent(const std::vector<EditCommand>& commands);
 
   // Executes the edit command.
-  void ExecuteEditCommand(const std::string& command,
-                          const std::string& value);
+  void ExecuteEditCommand(const std::string& command, const std::string& value);
 
   // Tells the renderer to scroll the currently focused node into rect only if
   // the currently focused node is a Text node (textfield, text area or content
@@ -400,11 +398,10 @@ class CONTENT_EXPORT RenderWidgetHostImpl : public RenderWidgetHost,
                              base::TimeDelta interval);
 
   // Called by the view in response to OnSwapCompositorFrame.
-  static void SendSwapCompositorFrameAck(
-      int32_t route_id,
-      uint32_t output_surface_id,
-      int renderer_host_id,
-      const cc::CompositorFrameAck& ack);
+  static void SendSwapCompositorFrameAck(int32_t route_id,
+                                         uint32_t output_surface_id,
+                                         int renderer_host_id,
+                                         const cc::CompositorFrameAck& ack);
 
   // Called by the view to return resources to the compositor.
   static void SendReclaimCompositorResources(int32_t route_id,
@@ -702,6 +699,10 @@ class CONTENT_EXPORT RenderWidgetHostImpl : public RenderWidgetHost,
   // Mouse event callbacks.
   std::vector<MouseEventCallback> mouse_event_callbacks_;
 
+  // Input event callbacks.
+  base::ObserverList<RenderWidgetHost::InputEventObserver>
+      input_event_observers_;
+
   // If true, then we should repaint when restoring even if we have a
   // backingstore.  This flag is set to true if we receive a paint message
   // while is_hidden_ to true.  Even though we tell the render widget to hide