Expose WEBGL_debug_renderer_info through a chromium finch experiment.

public/web/WebFrameClient.h

 /*
  * Copyright (C) 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 352 matching lines @@
     // This call is placed here instead of WebPermissionClient because this
     // class is implemented in content/, and putting it here avoids adding
     // more public content/ APIs.
     virtual bool allowWebGL(WebFrame*, bool defaultValue) { return defaultValue; }
 
     // Notifies the client that a WebGL context was lost on this page with the
     // given reason (one of the GL_ARB_robustness status codes; see
     // Extensions3D.h in WebCore/platform/graphics).
     virtual void didLoseWebGLContext(WebFrame*, int) { }
 
+    // Asks if the WebGL extension WEBGL_debug_renderer_info is allowed
+    // for the given WebFrame.
+    virtual bool allowWebGLDebugRendererInfo(WebFrame*) { return false; }
+
 protected:
     ~WebFrameClient() { }
 };
 
 } // namespace WebKit
 
 #endif