Refactor RenderWidgetHost::set_paint_observer()

chrome/browser/automation/automation_provider_observers.cc

 // Copyright (c) 2010 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/automation/automation_provider_observers.h"
 
 #include <deque>
 #include <string>
 #include <vector>
 
@@ skipping 1372 matching lines @@
   } else {
     entire_page_size_.set_height(dimension);
 
     ThumbnailGenerator* generator =
         g_browser_process->GetThumbnailGenerator();
     ThumbnailGenerator::ThumbnailReadyCallback* callback =
         NewCallback(this, &PageSnapshotTaker::OnSnapshotTaken);
     // Don't actually start the thumbnail generator, this leads to crashes on
     // Mac, crbug.com/62986. Instead, just hook the generator to the
     // RenderViewHost manually.
-    render_view_->set_painting_observer(generator);
+
+    generator->MonitorRenderer(render_view_, true);
     generator->AskForSnapshot(render_view_, false, callback,
                               entire_page_size_, entire_page_size_);
   }
 }
 
 void PageSnapshotTaker::OnSnapshotTaken(const SkBitmap& bitmap) {
   base::ThreadRestrictions::ScopedAllowIO allow_io;
   std::vector<unsigned char> png_data;
   gfx::PNGCodec::EncodeBGRASkBitmap(bitmap, true, &png_data);
   int bytes_written = file_util::WriteFile(image_path_,
@@ skipping 225 matching lines @@
                  NotificationService::AllSources());
 }
 
 void RendererProcessClosedObserver::Observe(
     NotificationType type,
     const NotificationSource& source,
     const NotificationDetails& details) {
   AutomationJSONReply(automation_, reply_message_).SendSuccess(NULL);
   delete this;
 }