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diff --git a/chromium/mojo/examples/html_viewer/webthread_impl.h b/chromium/mojo/examples/html_viewer/webthread_impl.h
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+// Copyright 2014 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 MOJO_EXAMPLES_HTML_VIEWER_WEBTHREAD_IMPL_H_
+#define MOJO_EXAMPLES_HTML_VIEWER_WEBTHREAD_IMPL_H_
+
+#include <map>
+
+#include "base/memory/scoped_ptr.h"
+#include "base/threading/thread.h"
+#include "third_party/WebKit/public/platform/WebThread.h"
+
+namespace mojo {
+namespace examples {
+
+class WebThreadBase : public blink::WebThread {
+ public:
+  virtual ~WebThreadBase();
+
+  virtual void addTaskObserver(TaskObserver* observer);
+  virtual void removeTaskObserver(TaskObserver* observer);
+
+  virtual bool isCurrentThread() const = 0;
+
+ protected:
+  WebThreadBase();
+
+ private:
+  class TaskObserverAdapter;
+
+  typedef std::map<TaskObserver*, TaskObserverAdapter*> TaskObserverMap;
+  TaskObserverMap task_observer_map_;
+};
+
+class WebThreadImpl : public WebThreadBase {
+ public:
+  explicit WebThreadImpl(const char* name);
+  virtual ~WebThreadImpl();
+
+  virtual void postTask(Task* task);
+  virtual void postDelayedTask(Task* task, long long delay_ms);
+
+  virtual void enterRunLoop();
+  virtual void exitRunLoop();
+
+  base::MessageLoop* message_loop() const { return thread_->message_loop(); }
+
+  virtual bool isCurrentThread() const;
+
+ private:
+  scoped_ptr<base::Thread> thread_;
+};
+
+class WebThreadImplForMessageLoop : public WebThreadBase {
+ public:
+  explicit WebThreadImplForMessageLoop(
+      base::MessageLoopProxy* message_loop);
+  virtual ~WebThreadImplForMessageLoop();
+
+  virtual void postTask(Task* task);
+  virtual void postDelayedTask(Task* task, long long delay_ms);
+
+  virtual void enterRunLoop();
+  virtual void exitRunLoop();
+
+ private:
+  virtual bool isCurrentThread() const;
+  scoped_refptr<base::MessageLoopProxy> message_loop_;
+};
+
+}  // namespace examples
+}  // namespace mojo
+
+#endif  // MOJO_EXAMPLES_HTML_VIEWER_WEBTHREAD_IMPL_H_