Replace MouseWheel events with GestureScrollBegin in WebContentsObserver::DidGetUserInteraction

content/browser/renderer_host/render_widget_host_delegate.h

 // Copyright (c) 2012 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_RENDERER_HOST_RENDER_WIDGET_HOST_DELEGATE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_DELEGATE_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 60 matching lines @@
   // Callback to inform the browser that the renderer did not process the
   // specified events. This gives an opportunity to the browser to process the
   // event (used for keyboard shortcuts).
   virtual void HandleKeyboardEvent(const NativeWebKeyboardEvent& event) {}
 
   // Callback to inform the browser that the renderer did not process the
   // specified mouse wheel event.  Returns true if the browser has handled
   // the event itself.
   virtual bool HandleWheelEvent(const blink::WebMouseWheelEvent& event);
 
-  // Notification the user has performed a direct interaction (mouse down, mouse
-  // wheel, raw key down, gesture tap, or browser-initiated navigation) while
+  // Notification the user has performed a direct interaction (mouse down,
+  // scroll, raw key down, gesture tap, or browser-initiated navigation) while
   // focus was on the page. Informs the delegate that a user is interacting with
-  // a site. Only the first mouse wheel event during a scroll will trigger this
-  // method.
+  // a site.
   virtual void OnUserInteraction(RenderWidgetHostImpl* render_widget_host,
                                  const blink::WebInputEvent::Type type) {}
 
   // Callback to give the browser a chance to handle the specified gesture
   // event before sending it to the renderer.
   // Returns true if the |event| was handled.
   virtual bool PreHandleGestureEvent(const blink::WebGestureEvent& event);
 
   // Notifies that screen rects were sent to renderer process.
   virtual void DidSendScreenRects(RenderWidgetHostImpl* rwh) {}
@@ skipping 87 matching lines @@
   // WebContents.
   virtual void OnRenderFrameProxyVisibilityChanged(bool visible) {}
 
  protected:
   virtual ~RenderWidgetHostDelegate() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_DELEGATE_H_