Implement setSinkId() for media elements without src.

third_party/WebKit/Source/modules/audio_output_devices/AudioOutputDeviceClient.h

Index: third_party/WebKit/Source/modules/audio_output_devices/AudioOutputDeviceClient.h
diff --git a/third_party/WebKit/Source/modules/audio_output_devices/AudioOutputDeviceClient.h b/third_party/WebKit/Source/modules/audio_output_devices/AudioOutputDeviceClient.h
new file mode 100644
index 0000000000000000000000000000000000000000..1aee70d14bb7f0f93432ad5189b412d5b35918e3
--- /dev/null
+++ b/third_party/WebKit/Source/modules/audio_output_devices/AudioOutputDeviceClient.h
@@ -0,0 +1,36 @@
+// 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 AudioOutputDeviceClient_h
+#define AudioOutputDeviceClient_h
+
+#include "modules/ModulesExport.h"
+#include "platform/Supplementable.h"
+#include "public/platform/WebSetSinkIdCallbacks.h"
+#include "wtf/PassOwnPtr.h"
+
+namespace blink {
+
+class ExecutionContext;
+class LocalFrame;
+class WebString;
+class ScriptState;
+
+class AudioOutputDeviceClient : public WillBeHeapSupplement<LocalFrame> {
+public:
+    virtual ~AudioOutputDeviceClient() {}
+
+    // Checks that a given sink exists and has permissions to be used from the origin of the current frame.
+    virtual void checkIfAudioSinkExistsAndIsAuthorized(ExecutionContext*, const WebString& sinkId, PassOwnPtr<WebSetSinkIdCallbacks>) = 0;
+
+    // WillBeHeapSupplement requirements.
+    static AudioOutputDeviceClient* from(ExecutionContext*);
+    static const char* supplementName();
+};
+
+MODULES_EXPORT void provideAudioOutputDeviceClientTo(LocalFrame&, PassOwnPtrWillBeRawPtr<AudioOutputDeviceClient>);
+
+} // namespace blink
+
+#endif // AudioOutputDeviceClient_h