Implement setSinkId() for media elements without src.

components/test_runner/web_frame_test_proxy.h

 // 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 COMPONENTS_TEST_RUNNER_WEB_FRAME_TEST_PROXY_H_
 #define COMPONENTS_TEST_RUNNER_WEB_FRAME_TEST_PROXY_H_
 
 #include "base/basictypes.h"
 #include "components/test_runner/mock_screen_orientation_client.h"
 #include "components/test_runner/web_test_delegate.h"
@@ skipping 256 matching lines @@
     return Base::willCheckAndDispatchMessageEvent(
         source_frame, target_frame, target, event);
   }
 
   virtual void postAccessibilityEvent(const blink::WebAXObject& object,
                                       blink::WebAXEvent event) {
     base_proxy_->PostAccessibilityEvent(object, event);
     Base::postAccessibilityEvent(object, event);
   }
 
+  virtual void checkIfAudioSinkExistsAndIsAuthorized(
+      const blink::WebString& sink_id,
+      const blink::WebSecurityOrigin& security_origin,
+      blink::WebSetSinkIdCallbacks* web_callbacks) {
+    base_proxy_->CheckIfAudioSinkExistsAndIsAuthorized(sink_id, security_origin,
+                                                       web_callbacks);
+  }
+
  private:
   WebTestProxyBase* base_proxy_;
 
   DISALLOW_COPY_AND_ASSIGN(WebFrameTestProxy);
 };
 
 }  // namespace test_runner
 
 #endif  // COMPONENTS_TEST_RUNNER_WEB_FRAME_TEST_PROXY_H_