Add wheel support to sky-scrollable

sky/engine/core/frame/NewEventHandler.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_FRAME_NEWEVENTHANDLER_H_
 #define SKY_ENGINE_CORE_FRAME_NEWEVENTHANDLER_H_
 
 #include <map>
 #include "sky/engine/core/dom/Node.h"
 #include "sky/engine/core/rendering/HitTestRequest.h"
 #include "sky/engine/core/rendering/HitTestResult.h"
 #include "sky/engine/wtf/HashMap.h"
 
 namespace blink {
 
 class LocalFrame;
 class WebGestureEvent;
 class WebKeyboardEvent;
 class WebPointerEvent;
+class WebWheelEvent;
 
 class NewEventHandler {
     WTF_MAKE_NONCOPYABLE(NewEventHandler);
 public:
     explicit NewEventHandler(LocalFrame&);
     ~NewEventHandler();
 
     bool handlePointerEvent(const WebPointerEvent&);
     bool handleGestureEvent(const WebGestureEvent&);
     bool handleKeyboardEvent(const WebKeyboardEvent&);
+    bool handleWheelEvent(const WebWheelEvent&);
 
 private:
     bool handlePointerDownEvent(const WebPointerEvent&);
     bool handlePointerUpEvent(const WebPointerEvent&);
     bool handlePointerMoveEvent(const WebPointerEvent&);
     bool handlePointerCancelEvent(const WebPointerEvent&);
 
     bool dispatchGestureEvent(Node& target, const WebGestureEvent& event);
     bool dispatchPointerEvent(Node& target, const WebPointerEvent&);
     bool dispatchClickEvent(Node& capturingTarget, const WebPointerEvent&);
     bool dispatchKeyboardEvent(Node& target, const WebKeyboardEvent& event);
+    bool dispatchWheelEvent(Node& target, const WebWheelEvent& event);
 
     Node* targetForKeyboardEvent() const;
     Node* targetForHitTestResult(const HitTestResult& hitTestResult);
     HitTestResult performHitTest(const LayoutPoint&);
     void updateSelectionForPointerDown(const HitTestResult&, const WebPointerEvent&);
 
     typedef std::map<int, RefPtr<Node>> PointerTargetMap;
 
     LocalFrame& m_frame;
     PointerTargetMap m_targetForPointer;
     bool m_suppressNextCharEvent;
 };
 
 }
 
 #endif // SKY_ENGINE_CORE_FRAME_NEWEVENTHANDLER_H_