Implement setSinkId() for media elements without src.

content/renderer/render_frame_impl.h

 // 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.
 
 #ifndef CONTENT_RENDERER_RENDER_FRAME_IMPL_H_
 #define CONTENT_RENDERER_RENDER_FRAME_IMPL_H_
 
+#include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/files/file_path.h"
 #include "base/gtest_prod_util.h"
 #include "base/id_map.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/process/process_handle.h"
@@ skipping 559 matching lines @@
   bool exitFullscreen() override;
   blink::WebPermissionClient* permissionClient() override;
   blink::WebAppBannerClient* appBannerClient() override;
   void registerProtocolHandler(const blink::WebString& scheme,
                                const blink::WebURL& url,
                                const blink::WebString& title) override;
   void unregisterProtocolHandler(const blink::WebString& scheme,
                                  const blink::WebURL& url) override;
   blink::WebBluetooth* bluetooth() override;
   blink::WebUSBClient* usbClient() override;
+  void checkIfAudioSinkExistsAndIsAuthorized(
+      const blink::WebString& sink_id,
+      const blink::WebSecurityOrigin& security_origin,
+      blink::WebSetSinkIdCallbacks* web_callbacks) override;
 
 #if defined(ENABLE_WEBVR)
   blink::WebVRClient* webVRClient() override;
 #endif
 
   // WebPageSerializerClient implementation:
   void didSerializeDataForFrame(
       const blink::WebCString& data,
       blink::WebPageSerializerClient::PageSerializationStatus status) override;
 
@@ skipping 500 matching lines @@
 #endif
 
   base::WeakPtrFactory<RenderFrameImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_FRAME_IMPL_H_