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diff --git a/chromium/chrome/renderer/chrome_mock_render_thread.h b/chromium/chrome/renderer/chrome_mock_render_thread.h
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+++ b/chromium/chrome/renderer/chrome_mock_render_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 CHROME_RENDERER_CHROME_MOCK_RENDER_THREAD_H_
+#define CHROME_RENDERER_CHROME_MOCK_RENDER_THREAD_H_
+
+#include <string>
+
+#include "base/macros.h"
+#include "base/single_thread_task_runner.h"
+#include "content/public/test/mock_render_thread.h"
+
+// Extends content::MockRenderThread to know about extension messages.
+class ChromeMockRenderThread : public content::MockRenderThread {
+ public:
+  ChromeMockRenderThread();
+  ~ChromeMockRenderThread() override;
+
+  // content::RenderThread overrides.
+  scoped_refptr<base::SingleThreadTaskRunner> GetIOTaskRunner() override;
+
+  //////////////////////////////////////////////////////////////////////////
+  // The following functions are called by the test itself.
+
+  void set_io_task_runner(
+      const scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
+
+ protected:
+  scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeMockRenderThread);
+};
+
+#endif  // CHROME_RENDERER_CHROME_MOCK_RENDER_THREAD_H_