Support error handling for Surface readbacks

extensions/browser/api/capture_web_contents_function.h

 // Copyright 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 EXTENSIONS_BROWSER_API_CAPTURE_WEB_CONTENTS_FUNCTION_H_
 #define EXTENSIONS_BROWSER_API_CAPTURE_WEB_CONTENTS_FUNCTION_H_
 
 #include "extensions/browser/extension_function.h"
 #include "extensions/common/api/extension_types.h"
 
@@ skipping 24 matching lines @@
   enum FailureReason {
     FAILURE_REASON_UNKNOWN,
     FAILURE_REASON_ENCODING_FAILED,
     FAILURE_REASON_VIEW_INVISIBLE
   };
   virtual void OnCaptureFailure(FailureReason reason) = 0;
 
  private:
   typedef core_api::extension_types::ImageDetails ImageDetails;
 
-  void CopyFromBackingStoreComplete(bool succeed, const SkBitmap& bitmap);
+  void CopyFromBackingStoreComplete(bool succeed,
+                                    const SkBitmap& bitmap,
+                                    const int& response);
   void OnCaptureSuccess(const SkBitmap& bitmap);
 
   // |context_id_| is the ID used to find the relevant WebContents. In the
   // |tabs.captureVisibleTab()| api, this represents the window-id, and in the
   // |webview.captureVisibleRegion()| api, this represents the instance-id of
   // the guest.
   int context_id_;
 
   // The format (JPEG vs PNG) of the resulting image.  Set in RunAsync().
   ImageDetails::Format image_format_;
 
   // Quality setting to use when encoding jpegs.  Set in RunAsync().
   int image_quality_;
 
   DISALLOW_COPY_AND_ASSIGN(CaptureWebContentsFunction);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_CAPTURE_WEB_CONTENTS_FUNCTION_H_