Cast: cast.streaming API to support null audio (or video) track

chrome/browser/extensions/api/cast_streaming/cast_streaming_apitest.cc

Index: chrome/browser/extensions/api/cast_streaming/cast_streaming_apitest.cc
diff --git a/chrome/browser/extensions/api/cast_streaming/cast_streaming_apitest.cc b/chrome/browser/extensions/api/cast_streaming/cast_streaming_apitest.cc
index d5c9e044c0d8d03465bfd1a825f7a7da5c443cc0..b15c499270159ba111a67644225a6b1a5e0e3a13 100644
--- a/chrome/browser/extensions/api/cast_streaming/cast_streaming_apitest.cc
+++ b/chrome/browser/extensions/api/cast_streaming/cast_streaming_apitest.cc
@@ -69,6 +69,11 @@ IN_PROC_BROWSER_TEST_F(CastStreamingApiTest, StopNoStart) {
       << message_;
 }
 
+IN_PROC_BROWSER_TEST_F(CastStreamingApiTest, NullStream) {
+  ASSERT_TRUE(RunExtensionSubtest("cast_streaming", "null_stream.html"))
+      << message_;
+}
+
 namespace {
 
 // An in-process Cast receiver that examines the audio/video frames being