Defer app window appearance until first paint.

content/public/browser/web_contents_observer.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_
 
 #include "base/process/kill.h"
 #include "base/process/process_handle.h"
 #include "content/common/content_export.h"
@@ skipping 200 matching lines @@
   virtual void DidOpenRequestedURL(WebContents* new_contents,
                                    const GURL& url,
                                    const Referrer& referrer,
                                    WindowOpenDisposition disposition,
                                    PageTransition transition,
                                    int64 source_frame_id) {}
 
   virtual void FrameDetached(RenderViewHost* render_view_host,
                              int64 frame_id) {}
 
+  // This method is invoked when the renderer has completed its first paint
+  // after a non-empty layout.
+  virtual void DidFirstVisuallyNonEmptyPaint(int32 page_id) {}
+
   // These two methods correspond to the points in time when the spinner of the
   // tab starts and stops spinning.
   virtual void DidStartLoading(RenderViewHost* render_view_host) {}
   virtual void DidStopLoading(RenderViewHost* render_view_host) {}
 
   // When WebContents::Stop() is called, the WebContents stops loading and then
   // invokes this method. If there are ongoing navigations, their respective
   // failure methods will also be invoked.
   virtual void NavigationStopped() {}
 
@@ skipping 103 matching lines @@
   void WebContentsImplDestroyed();
 
   WebContentsImpl* web_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_