Defer app window appearance until first paint.

content/browser/web_contents/web_contents_impl.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_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 643 matching lines @@
                                       const GURL& url,
                                       const base::FilePath& plugin_path);
   void OnBrowserPluginMessage(const IPC::Message& message);
   void OnDidDownloadImage(int id,
                           int http_status_code,
                           const GURL& image_url,
                           const std::vector<SkBitmap>& bitmaps,
                           const std::vector<gfx::Size>& original_bitmap_sizes);
   void OnUpdateFaviconURL(int32 page_id,
                           const std::vector<FaviconURL>& candidates);
-
+  void OnFirstVisuallyNonEmptyPaint(int32 page_id);
   void OnMediaNotification(int64 player_cookie,
                            bool has_video,
                            bool has_audio,
                            bool is_playing);
 
   // Called by derived classes to indicate that we're no longer waiting for a
   // response. This won't actually update the throbber, but it will get picked
   // up at the next animation step if the throbber is going.
   void SetNotWaitingForResponse() { waiting_for_response_ = false; }
 
@@ skipping 300 matching lines @@
   // Maps the ids of pending image downloads to their callbacks
   typedef std::map<int, ImageDownloadCallback> ImageDownloadMap;
   ImageDownloadMap image_download_map_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_