Make rendering of MediaStreams reflect changes to its set of tracks.

content/browser/webrtc/webrtc_getusermedia_browsertest.cc

Index: content/browser/webrtc/webrtc_getusermedia_browsertest.cc
diff --git a/content/browser/webrtc/webrtc_getusermedia_browsertest.cc b/content/browser/webrtc/webrtc_getusermedia_browsertest.cc
index 57b608b49e04121b7e0e69b8cfa006b2ff54a58f..46aea8cb4dfce1ac47e17c863892ed19ec0b04ea 100644
--- a/content/browser/webrtc/webrtc_getusermedia_browsertest.cc
+++ b/content/browser/webrtc/webrtc_getusermedia_browsertest.cc
@@ -1515,4 +1515,23 @@ IN_PROC_BROWSER_TEST_F(WebRtcGetUserMediaBrowserTest,
                 "failTestAfterTimeout('Got no mute event', 1500);"));
 }
 
+IN_PROC_BROWSER_TEST_F(WebRtcGetUserMediaBrowserTest, SrcObjectAddVideoTrack) {
+  ASSERT_TRUE(embedded_test_server()->Start());
+  GURL url(embedded_test_server()->GetURL("/media/getusermedia.html"));
+  NavigateToURL(shell(), url);
+  ExecuteJavascriptAndWaitForOk("srcObjectAddVideoTrack()");
+}
+
+IN_PROC_BROWSER_TEST_F(WebRtcGetUserMediaBrowserTest,
+                       SrcObjectRemoveVideoTrack) {
+  ASSERT_TRUE(embedded_test_server()->Start());
+  GURL url(embedded_test_server()->GetURL("/media/getusermedia.html"));
+  NavigateToURL(shell(), url);
+  ExecuteJavascriptAndWaitForOk("srcObjectRemoveVideoTrack()");
+}
+
+// TODO(guidou): Add SrcObjectAddAudioTrack and SrcObjectRemoveAudioTrack when
+// a straightforward mechanism to detect the presence/absence of audio in a
+// media element with an assigned MediaStream becomes available.
+
 }  // namespace content