Change Page::m_mainFrame to be a Frame.

Source/web/PageWidgetDelegate.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 36 matching lines @@
 
 namespace blink {
 
 static inline FrameView* mainFrameView(Page* page)
 {
     if (!page)
         return 0;
     // FIXME: Can we remove this check?
     if (!page->mainFrame())
         return 0;
-    return page->mainFrame()->view();
+    if (!page->mainFrame()->isLocalFrame())
+        return 0;
+    return toLocalFrame(page->mainFrame())->view();
 }
 
 void PageWidgetDelegate::animate(Page* page, double monotonicFrameBeginTime)
 {
     RefPtr<FrameView> view = mainFrameView(page);
     if (!view)
         return;
     page->autoscrollController().animate(monotonicFrameBeginTime);
     page->animator().serviceScriptedAnimations(monotonicFrameBeginTime);
 }
@@ skipping 10 matching lines @@
     if (rect.isEmpty())
         return;
     GraphicsContext gc(canvas);
     gc.setCertainlyOpaque(background == Opaque);
     gc.applyDeviceScaleFactor(page->deviceScaleFactor());
     gc.setUseHighResMarkers(page->deviceScaleFactor() > 1.5f);
     IntRect dirtyRect(rect);
     gc.save(); // Needed to save the canvas, not the GraphicsContext.
     FrameView* view = mainFrameView(page);
     // FIXME: Can we remove the mainFrame()->document() check?
-    if (view && page->mainFrame()->document()) {
+    if (view && toLocalFrame(page->mainFrame())->document()) {
         gc.clip(dirtyRect);
         view->paint(&gc, dirtyRect);
         if (overlays)
             overlays->paintWebFrame(gc);
     } else {
         gc.fillRect(dirtyRect, Color::white);
     }
     gc.restore();
 }
 
 bool PageWidgetDelegate::handleInputEvent(Page* page, PageWidgetEventHandler& handler, const WebInputEvent& event)
 {
-    LocalFrame* frame = page ? page->mainFrame() : 0;
+    LocalFrame* frame = page && page->mainFrame()->isLocalFrame() ? toLocalFrame(page->mainFrame()) : 0;
     switch (event.type) {
 
     // FIXME: WebKit seems to always return false on mouse events processing
     // methods. For now we'll assume it has processed them (as we are only
     // interested in whether keyboard events are processed).
     case WebInputEvent::MouseMove:
         if (!frame || !frame->view())
             return true;
         handler.handleMouseMove(*frame, *static_cast<const WebMouseEvent*>(&event));
         return true;
@@ skipping 90 matching lines @@
 {
     return mainFrame.eventHandler().handleWheelEvent(PlatformWheelEventBuilder(mainFrame.view(), event));
 }
 
 bool PageWidgetEventHandler::handleTouchEvent(LocalFrame& mainFrame, const WebTouchEvent& event)
 {
     return mainFrame.eventHandler().handleTouchEvent(PlatformTouchEventBuilder(mainFrame.view(), event));
 }
 
 }