Give prerendering RVH's RenderWidgetHostViews.

chrome/browser/prerender/prerender_final_status.h

 // Copyright (c) 2011 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 CHROME_BROWSER_PRERENDER_PRERENDER_FINAL_STATUS_H_
 #define CHROME_BROWSER_PRERENDER_PRERENDER_FINAL_STATUS_H_
 
 namespace prerender {
 
 // FinalStatus indicates whether |this| was used, or why it was cancelled.
@@ skipping 12 matching lines @@
   FINAL_STATUS_HTTPS,
   FINAL_STATUS_DOWNLOAD,
   FINAL_STATUS_MEMORY_LIMIT_EXCEEDED,
   FINAL_STATUS_JS_OUT_OF_MEMORY,
   FINAL_STATUS_RENDERER_UNRESPONSIVE,
   FINAL_STATUS_TOO_MANY_PROCESSES,
   FINAL_STATUS_RATE_LIMIT_EXCEEDED,
   FINAL_STATUS_PENDING_SKIPPED,
   FINAL_STATUS_CONTROL_GROUP,
   FINAL_STATUS_HTML5_MEDIA,
+  FINAL_STATUS_COMPOSITING,

[cbentzel, 2011/04/19 17:42:41]

Is this compositing specific, or GPU oriented? Will stuff like WebGL trigger
this case?

[mmenke, 2011/04/19 20:00:01]

WebGL uses compositing, I believe, so it will.  Basically anything that causes
the renderer to ask us for a window handle that it can draw to will result in
this failure, since we can't provide one.

   FINAL_STATUS_MAX,
 };
 
 void RecordFinalStatus(FinalStatus final_status);
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_FINAL_STATUS_H_