Relanding this with fixes to the mac dbg builder

content/ppapi_plugin/ppapi_webkit_thread.cc

-// Copyright (c) 2011 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 "content/ppapi_plugin/ppapi_webkit_thread.h"
-
-#include "base/logging.h"
-#include "content/ppapi_plugin/ppapi_webkitplatformsupport_impl.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebKit.h"
-
-PpapiWebKitThread::PpapiWebKitThread() {
-  DCHECK(!webkit_thread_.get());
-
-  webkit_thread_.reset(new InternalWebKitThread);
-  bool started = webkit_thread_->Start();
-  DCHECK(started);
-}
-
-PpapiWebKitThread::~PpapiWebKitThread() {
-}
-
-void PpapiWebKitThread::PostTask(const tracked_objects::Location& from_here,
-                                 const base::Closure& task) {
-  webkit_thread_->message_loop()->PostTask(from_here, task);
-}
-
-PpapiWebKitThread::InternalWebKitThread::InternalWebKitThread()
-    : base::Thread("PPAPIWebKit") {
-}
-
-PpapiWebKitThread::InternalWebKitThread::~InternalWebKitThread() {
-  Stop();
-}
-
-void PpapiWebKitThread::InternalWebKitThread::Init() {
-  DCHECK(!webkit_platform_support_.get());
-  webkit_platform_support_.reset(new PpapiWebKitPlatformSupportImpl);
-  WebKit::initialize(webkit_platform_support_.get());
-}
-
-void PpapiWebKitThread::InternalWebKitThread::CleanUp() {
-  DCHECK(webkit_platform_support_.get());
-  WebKit::shutdown();
-}