Extract a DOMWindow interface from LocalDOMWindow and use it in the idl.

Source/core/events/MouseRelatedEvent.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 22 matching lines @@
 namespace blink {
 
 MouseRelatedEvent::MouseRelatedEvent()
     : m_isSimulated(false)
     , m_hasCachedRelativePosition(false)
 {
 }
 
 static LayoutSize contentsScrollOffset(AbstractView* abstractView)
 {
-    if (!abstractView)
+    if (!abstractView || !abstractView->isLocalDOMWindow())
         return LayoutSize();
-    LocalFrame* frame = abstractView->frame();
+    LocalFrame* frame = toLocalDOMWindow(abstractView)->frame();
     if (!frame)
         return LayoutSize();
     FrameView* frameView = frame->view();
     if (!frameView)
         return LayoutSize();
     float scaleFactor = frame->pageZoomFactor();
     return LayoutSize(frameView->scrollX() / scaleFactor, frameView->scrollY() / scaleFactor);
 }
 
 MouseRelatedEvent::MouseRelatedEvent(const AtomicString& eventType, bool canBubble, bool cancelable, PassRefPtrWillBeRawPtr<AbstractView> abstractView,
                                      int detail, const IntPoint& screenLocation, const IntPoint& windowLocation,
                                      const IntPoint& movementDelta,
                                      bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, bool isSimulated)
     : UIEventWithKeyState(eventType, canBubble, cancelable, abstractView, detail, ctrlKey, altKey, shiftKey, metaKey)
     , m_screenLocation(screenLocation)
     , m_movementDelta(movementDelta)
     , m_isSimulated(isSimulated)
 {
     LayoutPoint adjustedPageLocation;
     LayoutPoint scrollPosition;
 
-    LocalFrame* frame = view() ? view()->frame() : 0;
+    LocalFrame* frame = view() && view()->isLocalDOMWindow() ? toLocalDOMWindow(view())->frame() : 0;

[dcheng, 2014/10/31 03:20:41]

It was quite a surprise to me that you can pass arbitrary Window objects to
initMouseEvent, etc. Right now, this means web pages could potentially inspect
the page zoom factor cross origin. With this change (and actual
RemoteDOMWindows), this would no longer be possible. I don't think this will be
a web compat problem, but I'm not 100% sure.

     if (frame && !isSimulated) {
         if (FrameView* frameView = frame->view()) {
             scrollPosition = frameView->scrollPosition();
             adjustedPageLocation = frameView->windowToContents(windowLocation);
             float scaleFactor = 1 / frame->pageZoomFactor();
             if (scaleFactor != 1.0f) {
                 adjustedPageLocation.scale(scaleFactor, scaleFactor);
                 scrollPosition.scale(scaleFactor, scaleFactor);
             }
         }
@@ skipping 25 matching lines @@
 
     m_layerLocation = m_pageLocation;
     m_offsetLocation = m_pageLocation;
 
     computePageLocation();
     m_hasCachedRelativePosition = false;
 }
 
 static float pageZoomFactor(const UIEvent* event)
 {
-    LocalDOMWindow* window = event->view();
-    if (!window)
+    if (!event->view() || !event->view()->isLocalDOMWindow())
         return 1;
-    LocalFrame* frame = window->frame();
+    LocalFrame* frame = toLocalDOMWindow(event->view())->frame();
     if (!frame)
         return 1;
     return frame->pageZoomFactor();
 }
 
 void MouseRelatedEvent::computePageLocation()
 {
     float scaleFactor = pageZoomFactor(this);
     setAbsoluteLocation(roundedLayoutPoint(FloatPoint(pageX() * scaleFactor, pageY() * scaleFactor)));
 }
@@ skipping 97 matching lines @@
     // See Microsoft documentation and <http://www.quirksmode.org/dom/w3c_events.html>.
     return m_clientLocation.y();
 }
 
 void MouseRelatedEvent::trace(Visitor* visitor)
 {
     UIEventWithKeyState::trace(visitor);
 }
 
 } // namespace blink