Allow CopyFromBackingStore to fallback to copying from the renderer side if the accelerated surface…

chrome/browser/ui/snapshot_tab_helper.cc

-// Copyright (c) 2012 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 "chrome/browser/ui/snapshot_tab_helper.h"
-
-#include "chrome/common/chrome_notification_types.h"
-#include "chrome/common/render_messages.h"
-#include "content/public/browser/notification_service.h"
-#include "content/public/browser/web_contents.h"
-
-using content::WebContents;
-
-DEFINE_WEB_CONTENTS_USER_DATA_KEY(SnapshotTabHelper);
-
-SnapshotTabHelper::SnapshotTabHelper(WebContents* web_contents)
-    : content::WebContentsObserver(web_contents) {
-}
-
-SnapshotTabHelper::~SnapshotTabHelper() {
-}
-
-void SnapshotTabHelper::CaptureSnapshot() {
-  Send(new ChromeViewMsg_CaptureSnapshot(routing_id()));
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// WebContentsObserver overrides
-
-bool SnapshotTabHelper::OnMessageReceived(const IPC::Message& message) {
-  bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP(SnapshotTabHelper, message)
-    IPC_MESSAGE_HANDLER(ChromeViewHostMsg_Snapshot, OnSnapshot)
-    IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP()
-  return handled;
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// Internal helpers
-
-void SnapshotTabHelper::OnSnapshot(const SkBitmap& bitmap) {
-  content::NotificationService::current()->Notify(
-      chrome::NOTIFICATION_TAB_SNAPSHOT_TAKEN,
-      content::Source<WebContents>(web_contents()),
-      content::Details<const SkBitmap>(&bitmap));
-}