Add sinkId/setSinkId() extension to HTMLMediaElement.

Source/modules/audio_output_devices/HTMLMediaElementAudioOutputDevice.h

Index: Source/modules/audio_output_devices/HTMLMediaElementAudioOutputDevice.h
diff --git a/Source/modules/audio_output_devices/HTMLMediaElementAudioOutputDevice.h b/Source/modules/audio_output_devices/HTMLMediaElementAudioOutputDevice.h
new file mode 100644
index 0000000000000000000000000000000000000000..f75cedd438c24f3b923734d57dcc7e17f68e5abd
--- /dev/null
+++ b/Source/modules/audio_output_devices/HTMLMediaElementAudioOutputDevice.h
@@ -0,0 +1,37 @@
+// Copyright 2015 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 HTMLMediaElementAudioOutputDevice_h
+#define HTMLMediaElementAudioOutputDevice_h
+
+#include "bindings/core/v8/ScriptPromise.h"
+#include "core/dom/ContextLifecycleObserver.h"
+#include "core/dom/ExceptionCode.h"
+#include "core/html/HTMLMediaElement.h"
+#include "platform/Supplementable.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class HTMLMediaElement;
+class ScriptState;
+
+class HTMLMediaElementAudioOutputDevice final : public NoBaseWillBeGarbageCollectedFinalized<HTMLMediaElementAudioOutputDevice>, public WillBeHeapSupplement<HTMLMediaElement> {
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(HTMLMediaElementAudioOutputDevice);
+public:
+    DECLARE_VIRTUAL_TRACE();
+    static String sinkId(HTMLMediaElement&);
+    static ScriptPromise setSinkId(ScriptState*, HTMLMediaElement&, const String& newSinkId);
+
+private:
+    HTMLMediaElementAudioOutputDevice();
+    static HTMLMediaElementAudioOutputDevice& from(HTMLMediaElement&);
+    static const char* supplementName();
+
+    String m_sinkId;
+};
+
+} // namespace blink
+
+#endif