Fix NTP thumbnail generation

chrome/browser/thumbnails/thumbnailing_context.h

 // Copyright (c) 2013 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_THUMBNAILS_THUMBNAILING_CONTEXT_H_
 #define CHROME_BROWSER_THUMBNAILS_THUMBNAILING_CONTEXT_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/thumbnails/thumbnail_service.h"
@@ skipping 27 matching lines @@
   ThumbnailingContext(content::WebContents* web_contents,
                       ThumbnailService* receiving_service,
                       bool load_interrupted);
 
   // Create an instance for use with unit tests.
   static ThumbnailingContext* CreateThumbnailingContextForTest() {
     return new ThumbnailingContext();
   }
 
   scoped_refptr<ThumbnailService> service;
+  content::WebContents* web_contents;
   GURL url;
   ClipResult clip_result;
   gfx::Size requested_copy_size;
   ThumbnailScore score;
 
  private:
   ThumbnailingContext();
   ~ThumbnailingContext();
 
   friend class base::RefCountedThreadSafe<ThumbnailingContext>;
 };
 
 }  // namespace thumbnails
 
 #endif  // CHROME_BROWSER_THUMBNAILS_THUMBNAILING_CONTEXT_H_