Snapshot a pointer to the main frame when creating WebViewFrameWidget.

public/web/WebFrameWidget.h

 /*
  * Copyright (C) 2014 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 28 matching lines @@
 
 class WebLocalFrame;
 class WebView;
 class WebWidgetClient;
 
 class WebFrameWidget : public WebWidget {
 public:
     BLINK_EXPORT static WebFrameWidget* create(WebWidgetClient*, WebLocalFrame*);
     // Creates a frame widget for a WebView. Temporary helper to help transition
     // away from WebView inheriting WebWidget.
-    BLINK_EXPORT static WebFrameWidget* create(WebView*);
+    // TODO(dcheng): Remove once transition is complete.
+    BLINK_EXPORT static WebFrameWidget* create(WebWidgetClient*, WebView*, WebLocalFrame* mainFrame);
 
     // Sets the visibility of the WebFrameWidget.
     // We still track page-level visibility, but additionally we need to notify a WebFrameWidget
     // when its owning RenderWidget receives a Show or Hide directive, so that it knows whether
     // it needs to draw or not.
     virtual void setVisibilityState(WebPageVisibilityState visibilityState, bool isInitialState) { }
 
     // Temporary: there should only be one WebFrameWidget implementation but the
     // Blink API is currently in a transition state. See https://goo.gl/7yVrnb
     virtual bool forSubframe() const { return true; }
 };
 
 } // namespace blink
 
 #endif