Add debugging flag --simulate-touch-screen-with-mouse.

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 b7a528e2104f2a476d8331b6cda2eaa63825b938..572c520898c79b8bc95e75e025021a31b03f8610 100644
--- a/content/browser/renderer_host/render_widget_host_impl.h
+++ b/content/browser/renderer_host/render_widget_host_impl.h
@@ -587,6 +587,8 @@ class CONTENT_EXPORT RenderWidgetHostImpl : virtual public RenderWidgetHost,
   // previously queued coalesced gesture if it exists.
   void ProcessGestureAck(bool processed, int type);
 
+  void SimulateTouchGestureWithMouse(const WebKit::WebMouseEvent& mouse_event);
+
   // Called on OnMsgInputEventAck() to process a touch event ack message.
   // This can result in a gesture event being generated and sent back to the
   // renderer.