Implement setSinkId() for media elements without src.

components/test_runner/web_test_proxy.cc

 // 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.
 
 #include "components/test_runner/web_test_proxy.h"
 
 #include <cctype>
 
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
@@ skipping 1390 matching lines @@
   }
 }
 
 void WebTestProxyBase::ResetInputMethod() {
   // If a composition text exists, then we need to let the browser process
   // to cancel the input method's ongoing composition session.
   if (web_widget_)
     web_widget_->confirmComposition();
 }
 
+void WebTestProxyBase::CheckIfAudioSinkExistsAndIsAuthorized(
+    const blink::WebString& sink_id,
+    const blink::WebSecurityOrigin& security_origin,
+    blink::WebSetSinkIdCallbacks* web_callbacks) {
+  scoped_ptr<blink::WebSetSinkIdCallbacks> callback(web_callbacks);
+  std::string device_id = sink_id.utf8();
+  if (device_id == "valid" || device_id.empty())
+    callback->onSuccess();
+  else if (device_id == "unauthorized")
+    callback->onError(blink::WebSetSinkIdError::NotAuthorized);
+  else
+    callback->onError(blink::WebSetSinkIdError::NotFound);
+}
+
 blink::WebString WebTestProxyBase::acceptLanguages() {
   return blink::WebString::fromUTF8(accept_languages_);
 }
 
 }  // namespace test_runner