Implement setSinkId() for media elements without src.

components/test_runner/web_frame_test_proxy.h

Index: components/test_runner/web_frame_test_proxy.h
diff --git a/components/test_runner/web_frame_test_proxy.h b/components/test_runner/web_frame_test_proxy.h
index 00a287c4b2a496e212455756b22970c0c3b79235..589a832726b61eda30f3bef17213f0e84a490cc2 100644
--- a/components/test_runner/web_frame_test_proxy.h
+++ b/components/test_runner/web_frame_test_proxy.h
@@ -274,6 +274,14 @@ class WebFrameTestProxy : public Base {
     Base::postAccessibilityEvent(object, event);
   }
 
+  virtual void checkIfAudioSinkExistsAndIsAuthorized(
+      const blink::WebString& sink_id,
+      const blink::WebSecurityOrigin& security_origin,
+      blink::WebSetSinkIdCallbacks* web_callback) {
+    base_proxy_->CheckIfAudioSinkExistsAndIsAuthorized(sink_id, security_origin,
+                                                       web_callback);

[Peter Beverloo, 2015/11/12 16:45:42]

nit: web_callbacks (elsewhere too)

[Guido Urdaneta, 2015/11/12 18:45:44]

Done.

+  }
+
  private:
   WebTestProxyBase* base_proxy_;