Make RootView::DispatchGestureEvent() non-virtual

ui/events/event.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 UI_EVENTS_EVENT_H_
 #define UI_EVENTS_EVENT_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/event_types.h"
@@ skipping 166 matching lines @@
 
   bool IsFlingScrollEvent() const {
     return type_ == ET_SCROLL_FLING_CANCEL ||
            type_ == ET_SCROLL_FLING_START;
   }
 
   bool IsMouseWheelEvent() const {
     return type_ == ET_MOUSEWHEEL;
   }
 
+  // Convenience methods to cast |this| to a GestureEvent. IsGestureEvent()
+  // must be true as a precondition to calling these methods.
+  GestureEvent* AsGestureEvent();
+  const GestureEvent* AsGestureEvent() const;
+
   // Returns true if the event has a valid |native_event_|.
   bool HasNativeEvent() const;
 
   // Immediately stops the propagation of the event. This must be called only
   // from an EventHandler during an event-dispatch. Any event handler that may
   // be in the list will not receive the event after this is called.
   // Note that StopPropagation() can be called only for cancelable events.
   void StopPropagation();
   bool stopped_propagation() const { return !!(result_ & ER_CONSUMED); }
 
@@ skipping 481 matching lines @@
 
   const GestureEventDetails& details() const { return details_; }
 
  private:
   GestureEventDetails details_;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_EVENT_H_