Canvas2d: Implement rerouting event by hit region's control.

third_party/WebKit/Source/core/events/MouseEvent.cpp

 /*
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2005, 2006, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 117 matching lines @@
     , m_syntheticEventType(syntheticEventType)
 {
 }
 
 MouseEvent::MouseEvent(const AtomicString& eventType, const MouseEventInit& initializer)
     : MouseRelatedEvent(eventType, initializer)
     , m_button(initializer.button())
     , m_buttons(initializer.buttons())
     , m_relatedTarget(initializer.relatedTarget())
     , m_syntheticEventType(PlatformMouseEvent::RealOrIndistinguishable)
+    , m_region(initializer.region())
 {
 }
 
 MouseEvent::~MouseEvent()
 {
 }
 
 unsigned short MouseEvent::platformModifiersToButtons(unsigned modifiers)
 {
     unsigned short buttons = 0;
@@ skipping 155 matching lines @@
     doubleClickEvent->setTrusted(mouseEvent.isTrusted());
     if (mouseEvent.defaultHandled())
         doubleClickEvent->setDefaultHandled();
     EventDispatcher::dispatchEvent(dispatcher.node(), MouseEventDispatchMediator::create(doubleClickEvent));
     if (doubleClickEvent->defaultHandled() || doubleClickEvent->defaultPrevented())
         return false;
     return !swallowEvent;
 }
 
 } // namespace blink