Support error handling for Surface readbacks

extensions/browser/api/capture_web_contents_function.cc

 // 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.
 
 #include "extensions/browser/api/capture_web_contents_function.h"
 
 #include "base/base64.h"
 #include "base/strings/stringprintf.h"
 #include "content/public/browser/render_widget_host.h"
 #include "content/public/browser/render_widget_host_view.h"
@@ skipping 73 matching lines @@
   host->CopyFromBackingStore(
       gfx::Rect(view_size),
       bitmap_size,
       base::Bind(&CaptureWebContentsFunction::CopyFromBackingStoreComplete,
                  this),
       kN32_SkColorType);
   return true;
 }
 
 void CaptureWebContentsFunction::CopyFromBackingStoreComplete(
-    bool succeeded,
-    const SkBitmap& bitmap) {
-  if (succeeded) {
+    const SkBitmap& bitmap,
+    content::ReadbackResponse response) {
+  if (response == content::READBACK_SUCCESS) {
     OnCaptureSuccess(bitmap);
     return;
   }
   OnCaptureFailure(FAILURE_REASON_UNKNOWN);
 }
 
 void CaptureWebContentsFunction::OnCaptureSuccess(const SkBitmap& bitmap) {
   std::vector<unsigned char> data;
   SkAutoLockPixels screen_capture_lock(bitmap);
   bool encoded = false;
@@ skipping 31 matching lines @@
       reinterpret_cast<const char*>(vector_as_array(&data)), data.size());
 
   base::Base64Encode(stream_as_string, &base64_result);
   base64_result.insert(
       0, base::StringPrintf("data:%s;base64,", mime_type.c_str()));
   SetResult(new base::StringValue(base64_result));
   SendResponse(true);
 }
 
 }  // namespace extensions