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diff --git a/content/ppapi_plugin/ppapi_webkit_thread.h b/content/ppapi_plugin/ppapi_webkit_thread.h
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+++ b/content/ppapi_plugin/ppapi_webkit_thread.h
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+// 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.
+
+#ifndef CONTENT_PPAPI_PLUGIN_PPAPI_WEBKIT_THREAD_H_
+#define CONTENT_PPAPI_PLUGIN_PPAPI_WEBKIT_THREAD_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/threading/thread.h"
+
+class PpapiWebKitClientImpl;
+
+// This creates a WebKit main thread on instantiation on construction and kills
+// it on deletion. See also content/browser/in_process_webkit for the
+// corresponding concept in the browser process.
+class PpapiWebKitThread {
+ public:
+  PpapiWebKitThread();
+  ~PpapiWebKitThread();
+
+  // Posts the given task to the thread, see MessageLoop::PostTask.
+  void PostTask(
+      const tracked_objects::Location& from_here,
+      const base::Closure& task);
+
+ private:
+  // Must be private so that we can carefully control its lifetime.
+  class InternalWebKitThread : public base::Thread {
+   public:
+    InternalWebKitThread();
+    virtual ~InternalWebKitThread();
+    // Does the actual initialization and shutdown of WebKit.  Called at the
+    // beginning and end of the thread's lifetime.
+    virtual void Init();
+    virtual void CleanUp();
+
+   private:
+    // The WebKitClient implementation.  Only access on WebKit thread.
+    scoped_ptr<PpapiWebKitClientImpl> webkit_client_;
+  };
+
+  // Pointer to the actual WebKitThread.
+  scoped_ptr<InternalWebKitThread> webkit_thread_;
+
+  DISALLOW_COPY_AND_ASSIGN(PpapiWebKitThread);
+};
+
+#endif  // CONTENT_PPAPI_PLUGIN_PPAPI_WEBKIT_THREAD_H_