Implement PointerEvent#dx

sky/engine/core/events/PointerEvent.h

 // Copyright 2015 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 SKY_ENGINE_CORE_EVENTS_POINTEREVENT_H_
 #define SKY_ENGINE_CORE_EVENTS_POINTEREVENT_H_
 
 #include "sky/engine/core/events/Event.h"
 #include "sky/engine/public/platform/WebInputEvent.h"
 
@@ skipping 59 matching lines @@
     double distance() const { return m_distance; }
     double distanceMin() const { return m_distanceMin; }
     double distanceMax() const { return m_distanceMax; }
     double radiusMajor() const { return m_radiusMajor; }
     double radiusMinor() const { return m_radiusMinor; }
     double radiusMin() const { return m_radiusMin; }
     double radiusMax() const { return m_radiusMax; }
     double orientation() const { return m_orientation; }
     double tilt() const { return m_tilt; }
 
+    void setDX(double dx) { m_dx = dx; }
+    void setDY(double dy) { m_dy = dy; }
+
 private:
     PointerEvent();
     explicit PointerEvent(const WebPointerEvent& event);
     PointerEvent(const AtomicString&, const PointerEventInit&);
 
     int m_pointer;
     String m_kind;
     double m_x;
     double m_y;
     double m_dx;
@@ skipping 12 matching lines @@
     double m_radiusMinor;
     double m_radiusMin;
     double m_radiusMax;
     double m_orientation;
     double m_tilt;
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_EVENTS_POINTEREVENT_H_