Add support for entering/exiting HTML fullscreen from OOPIFs.

third_party/WebKit/public/web/WebView.h

 /*
  * Copyright (C) 2009, 2010, 2011, 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 316 matching lines @@
     virtual void resetDeviceColorProfileForTesting() = 0;
 
     // Resize the view at the same time as changing the state of the top
     // controls. If |topControlsShrinkLayout| is true, the embedder shrunk the
     // WebView size by the top controls height.
     virtual void resizeWithTopControls(
         const WebSize&,
         float topControlsHeight,
         bool topControlsShrinkLayout) = 0;
 
+    // This is called in OOPIF scenarios when an element contained in a remote
+    // <iframe> is about to enter fullscreen.  The provided WebRemoteFrame
+    // identifies the frame containing the fullscreen element, and its frame
+    // owner corresponds to the HTMLFrameOwnerElement to be fullscreened.
+    // Calling this prepares FullscreenController to enter fullscreen for that
+    // frame owner.
+    virtual void willEnterFullScreen(WebRemoteFrame*) = 0;
+
     // Auto-Resize -----------------------------------------------------------
 
     // In auto-resize mode, the view is automatically adjusted to fit the html
     // content within the given bounds.
     virtual void enableAutoResizeMode(
         const WebSize& minSize,
         const WebSize& maxSize) = 0;
 
     // Turn off auto-resize.
     virtual void disableAutoResizeMode() = 0;
@@ skipping 186 matching lines @@
     // completed.
     WebWidget* widget() { return this; }
 
 protected:
     ~WebView() {}
 };
 
 } // namespace blink
 
 #endif