gestures: Generate only either scroll-end or fling-start events at the end of a scroll gesture.

ui/views/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_VIEWS_EVENTS_EVENT_H_
 #define UI_VIEWS_EVENTS_EVENT_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
@@ skipping 76 matching lines @@
            type_ == ui::ET_TOUCH_STATIONARY ||
            type_ == ui::ET_TOUCH_CANCELLED;
   }
 
   bool IsScrollGestureEvent() const {
     return type_ == ui::ET_GESTURE_SCROLL_BEGIN ||
            type_ == ui::ET_GESTURE_SCROLL_UPDATE ||
            type_ == ui::ET_GESTURE_SCROLL_END;
   }
 
+  bool IsFlingScrollEvent() const {
+    return type_ == ui::ET_SCROLL_FLING_CANCEL ||
+           type_ == ui::ET_SCROLL_FLING_START;
+  }
+
  protected:
   Event(ui::EventType type, int flags);
   Event(const NativeEvent& native_event, ui::EventType type, int flags);
   Event(const Event& model)
       : native_event_(model.native_event()),
         type_(model.type()),
         time_stamp_(model.time_stamp()),
         flags_(model.flags()) {
   }
 
@@ skipping 350 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(GestureEventForTest);
 };
 
 #if defined(OS_WIN)
 int GetModifiersFromKeyState();
 #endif
 
 }  // namespace views
 
 #endif  // UI_VIEWS_EVENTS_EVENT_H_