Implement Wheel Gesture Scrolling on OSX.

content/renderer/mus/render_widget_mus_connection.h

Index: content/renderer/mus/render_widget_mus_connection.h
diff --git a/content/renderer/mus/render_widget_mus_connection.h b/content/renderer/mus/render_widget_mus_connection.h
index 26f1b4bdfac8e01c7a1716a893a68b3f95a95e21..f69191b5399febf7b08c7269e38e3175b0ea143d 100644
--- a/content/renderer/mus/render_widget_mus_connection.h
+++ b/content/renderer/mus/render_widget_mus_connection.h
@@ -43,6 +43,9 @@ class RenderWidgetMusConnection : public RenderWidgetInputHandlerDelegate {
   void ObserveWheelEventAndResult(const blink::WebMouseWheelEvent& wheel_event,
                                   const gfx::Vector2dF& wheel_unused_delta,
                                   bool event_processed) override;
+  void ObserveGestureEventAndResult(const blink::WebGestureEvent& gesture_event,
+                                  const gfx::Vector2dF& wheel_unused_delta,

[tdresser, 2016/03/02 18:26:53]

nit:indent

[dtapuska, 2016/03/07 18:03:59]

Done.

+                                  bool event_processed) override;
   void OnDidHandleKeyEvent() override;
   void OnDidOverscroll(const DidOverscrollParams& params) override;
   void OnInputEventAck(scoped_ptr<InputEventAck> input_event_ack) override;