Implement MojoAudioRendererSink and use it in UtilityMojoMediaClient

media/mojo/services/media_service_unittest.cc

Index: media/mojo/services/media_service_unittest.cc
diff --git a/media/mojo/services/media_service_unittest.cc b/media/mojo/services/media_service_unittest.cc
index cf2c520f154a4923f26df3b7e2f0204eb52fbad1..b85a19254a5678919a17cbbfa7fbd0132cb0313a 100644
--- a/media/mojo/services/media_service_unittest.cc
+++ b/media/mojo/services/media_service_unittest.cc
@@ -139,8 +139,8 @@ class MediaServiceTest : public service_manager::test::ServiceTest {
         .Times(Exactly(1))
         .WillOnce(InvokeWithoutArgs(run_loop_.get(), &base::RunLoop::Quit));
     renderer_->Initialize(std::move(client_ptr_info), nullptr,
-                          std::move(video_stream_proxy), nullptr, base::nullopt,
-                          base::nullopt,
+                          std::move(video_stream_proxy), nullptr, nullptr,
+                          base::nullopt, base::nullopt,
                           base::Bind(&MediaServiceTest::OnRendererInitialized,
                                      base::Unretained(this)));
   }