Tweak the aura gesture recognizer slightly.

ui/aura/gestures/gesture_point.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_AURA_GESTURES_GESTURE_POINT_H_
 #define UI_AURA_GESTURES_GESTURE_POINT_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "ui/gfx/point.h"
@@ skipping 27 matching lines @@
 
   // Updates states depending on the event and the gesture-state.
   void UpdateValues(const TouchEvent& event, GestureState state);
 
   // Responds according to the state of the gesture point (i.e. the point can
   // represent a click or scroll etc.)
   bool IsInClickWindow(const TouchEvent& event) const;
   bool IsInDoubleClickWindow(const TouchEvent& event) const;
   bool IsInScrollWindow(const TouchEvent& event) const;
   bool IsInFlickWindow(const TouchEvent& event) const;
+  bool DidScroll(const TouchEvent& event) const;
 
   const gfx::Point& first_touch_position() const {
     return first_touch_position_;
   }
 
   double last_touch_time() const { return last_touch_time_; }
   const gfx::Point& last_touch_position() const { return last_touch_position_; }
 
   double x_delta() const {
     return last_touch_position_.x() - first_touch_position_.x();
@@ skipping 24 matching lines @@
 
   float x_velocity_;
   float y_velocity_;
 
   DISALLOW_COPY_AND_ASSIGN(GesturePoint);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_GESTURES_GESTURE_POINT_H_