Import TestRunner library into chromium.

content/shell/renderer/test_runner/MockWebAudioDevice.cpp

+// Copyright 2013 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/shell/renderer/test_runner/MockWebAudioDevice.h"
+
+using namespace blink;
+
+namespace WebTestRunner {
+
+MockWebAudioDevice::MockWebAudioDevice(double sampleRate)
+    : m_sampleRate(sampleRate)
+{
+}
+
+MockWebAudioDevice::~MockWebAudioDevice()
+{
+}
+
+void MockWebAudioDevice::start()
+{
+}
+
+void MockWebAudioDevice::stop()
+{
+}
+
+double MockWebAudioDevice::sampleRate()
+{
+    return m_sampleRate;
+}
+
+} // namespace WebTestRunner