Allow TabCapture to capture full screen flash widgets.

content/public/browser/web_contents_observer.h

Index: content/public/browser/web_contents_observer.h
diff --git a/content/public/browser/web_contents_observer.h b/content/public/browser/web_contents_observer.h
index acf251ee7dc454148b7c064f826d730edc74e87d..d8be201968585ea608ddf7553c72414d6a3025b6 100644
--- a/content/public/browser/web_contents_observer.h
+++ b/content/public/browser/web_contents_observer.h
@@ -152,6 +152,11 @@ class CONTENT_EXPORT WebContentsObserver : public IPC::Listener,
   virtual void DidUpdateFaviconURL(int32 page_id,
                                    const std::vector<FaviconURL>& candidates) {}
 
+  // Invoked when a pepper plugin creates and shows or destroys a fullscreen
+  // render widget.
+  virtual void DidShowFullscreenWidget(int routing_id) {}
+  virtual void DidDestroyFullscreenWidget(int routing_id) {}
+
   // IPC::Listener implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;