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diff --git a/media/cast/test/utility/standalone_cast_environment.h b/media/cast/test/utility/standalone_cast_environment.h
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+++ b/media/cast/test/utility/standalone_cast_environment.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 MEDIA_CAST_TEST_UTILITY_STANDALONE_CAST_ENVIRONMENT_H_
+#define MEDIA_CAST_TEST_UTILITY_STANDALONE_CAST_ENVIRONMENT_H_
+
+#include "base/threading/thread.h"
+#include "base/threading/thread_checker.h"
+#include "media/cast/cast_environment.h"
+
+namespace media {
+namespace cast {
+
+// A complete CastEnvironment where all task runners are spurned from
+// internally-owned threads.  Uses base::DefaultTickClock as a clock.
+class StandaloneCastEnvironment : public CastEnvironment,
+                                  public base::ThreadChecker {
+ public:
+  explicit StandaloneCastEnvironment(const CastLoggingConfig& logging_config);
+
+  // Stops all threads backing the task runners, blocking the caller until
+  // complete.
+  void Shutdown();
+
+ private:
+  virtual ~StandaloneCastEnvironment();
+
+  base::Thread main_thread_;
+  base::Thread audio_encode_thread_;
+  base::Thread audio_decode_thread_;
+  base::Thread video_encode_thread_;
+  base::Thread video_decode_thread_;
+  base::Thread transport_thread_;
+
+  DISALLOW_COPY_AND_ASSIGN(StandaloneCastEnvironment);
+};
+
+}  // namespace cast
+}  // namespace media
+
+#endif  // MEDIA_CAST_TEST_UTILITY_STANDALONE_CAST_ENVIRONMENT_H_