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

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

 // Copyright 2013 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 <algorithm>
 #include <cmath>
 
 #include "base/command_line.h"
 #include "base/float_util.h"
 #include "base/run_loop.h"
@@ skipping 51 matching lines @@
 IN_PROC_BROWSER_TEST_F(CastStreamingApiTest, DestinationNotSet) {
   ASSERT_TRUE(RunExtensionSubtest("cast_streaming", "destination_not_set.html"))
       << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(CastStreamingApiTest, StopNoStart) {
   ASSERT_TRUE(RunExtensionSubtest("cast_streaming", "stop_no_start.html"))
       << 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
 // received for expected colors and tones.  Used in
 // CastStreamingApiTest.EndToEnd, below.
 class TestPatternReceiver : public media::cast::InProcessReceiver {
  public:
   explicit TestPatternReceiver(
       const scoped_refptr<media::cast::CastEnvironment>& cast_environment,
       const net::IPEndPoint& local_end_point)
@@ skipping 260 matching lines @@
 
   delete receiver;
   cast_environment->Shutdown();
 }
 
 IN_PROC_BROWSER_TEST_F(CastStreamingApiTestWithPixelOutput, RtpStreamError) {
   ASSERT_TRUE(RunExtensionSubtest("cast_streaming", "rtp_stream_error.html"));
 }
 
 }  // namespace extensions