Support error handling for Surface readbacks

chrome/browser/ui/pdf/pdf_browsertest_base.h

 // Copyright 2014 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_UI_PDF_PDF_BROWSERTEST_BASE_H_
 #define CHROME_BROWSER_UI_PDF_PDF_BROWSERTEST_BASE_H_
 
 #include <string>
 
 #include "base/files/file_path.h"
@@ skipping 24 matching lines @@
 
   int load_stop_notification_count() const {
     return load_stop_notification_count_;
   }
 
   void Load();
   void WaitForResponse();
   bool VerifySnapshot(const std::string& expected_filename);
 
  private:
-  void CopyFromBackingStoreCallback(bool success, const SkBitmap& bitmap);
+  void CopyFromBackingStoreCallback(bool success,
+                                    const SkBitmap& bitmap,
+                                    const int& response);
 
   // content::NotificationObserver
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // InProcessBrowserTest
   virtual void SetUpCommandLine(base::CommandLine* command_line) OVERRIDE;
 
   // True if the snapshot differed from the expected value.
   bool snapshot_different_;
   // Internal variable used to synchronize to the renderer.
   int next_dummy_search_value_;
   // The filename of the bitmap to compare the snapshot to.
   std::string expected_filename_;
   // If the snapshot is different, holds the location where it's saved.
   base::FilePath snapshot_filename_;
   // How many times we've seen chrome::LOAD_STOP.
   int load_stop_notification_count_;
 
   net::test_server::EmbeddedTestServer pdf_test_server_;
 
   DISALLOW_COPY_AND_ASSIGN(PDFBrowserTest);
 };
 
 #endif  // CHROME_BROWSER_UI_PDF_PDF_BROWSERTEST_BASE_H_