Cast: Make castv2 mirroring performance test run again

media/cast/test/utility/standalone_cast_environment.cc

Index: media/cast/test/utility/standalone_cast_environment.cc
diff --git a/media/cast/test/utility/standalone_cast_environment.cc b/media/cast/test/utility/standalone_cast_environment.cc
index 790b283fad951a416f9dd894ea3c58ec6427e89d..fd47ded5ca53cb75894291d71248d58d4b64a42d 100644
--- a/media/cast/test/utility/standalone_cast_environment.cc
+++ b/media/cast/test/utility/standalone_cast_environment.cc
@@ -26,6 +26,22 @@ StandaloneCastEnvironment::StandaloneCastEnvironment()
                      base::Thread::Options(base::MessageLoop::TYPE_IO, 0));
   CREATE_TASK_RUNNER(audio, base::Thread::Options());
   CREATE_TASK_RUNNER(video, base::Thread::Options());
+}
+
+StandaloneCastEnvironment::StandaloneCastEnvironment(
+    scoped_ptr<base::TickClock> clock)
+    : CastEnvironment(
+          clock.Pass(),
+          NULL,
+          NULL,
+          NULL),
+      main_thread_("StandaloneCastEnvironment Main"),
+      audio_thread_("StandaloneCastEnvironment Audio"),
+      video_thread_("StandaloneCastEnvironment Video") {
+  CREATE_TASK_RUNNER(main,
+                     base::Thread::Options(base::MessageLoop::TYPE_IO, 0));
+  CREATE_TASK_RUNNER(audio, base::Thread::Options());
+  CREATE_TASK_RUNNER(video, base::Thread::Options());
 
 #undef CREATE_TASK_RUNNER
 }