Deliver change notifications to SourceBuffer track lists.

third_party/WebKit/LayoutTests/http/tests/media/media-source/mediasource-avtracks.html

Index: third_party/WebKit/LayoutTests/http/tests/media/media-source/mediasource-avtracks.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/media/media-source/mediasource-avtracks.html b/third_party/WebKit/LayoutTests/http/tests/media/media-source/mediasource-avtracks.html
index 6e3e1be992c1e96dc45dbfa6dd915b06c757894b..f4aef3cf18730ed7e95efa9270224a7d58b48ad0 100644
--- a/third_party/WebKit/LayoutTests/http/tests/media/media-source/mediasource-avtracks.html
+++ b/third_party/WebKit/LayoutTests/http/tests/media/media-source/mediasource-avtracks.html
@@ -120,6 +120,29 @@
                 }));
             }, "Media tracks must be removed when the HTMLMediaElement.load() is called");
 
+            mediasource_testafterdataloaded(function(test, mediaElement, mediaSource, segmentInfo, sourceBuffer, mediaData)
+            {
+                loadMediaAndVerifyAddedTracks(test, mediaElement, segmentInfo, sourceBuffer, mediaData, test.step_func(function ()
+                {
+                    test.expectEvent(mediaElement.audioTracks, "change", "mediaElement.audioTracks changed.");
+                    test.expectEvent(mediaElement.videoTracks, "change", "mediaElement.videoTracks changed.");
+                    test.expectEvent(sourceBuffer.audioTracks, "change", "mediaElement.audioTracks changed.");
+                    test.expectEvent(sourceBuffer.videoTracks, "change", "mediaElement.videoTracks changed.");
+                    mediaElement.audioTracks[0].enabled = false;
+                    mediaElement.videoTracks[0].selected = false;
+                    test.waitForExpectedEvents(test.step_func(function()
+                    {
+                        test.expectEvent(mediaElement.audioTracks, "change", "mediaElement.audioTracks changed.");
+                        test.expectEvent(mediaElement.videoTracks, "change", "mediaElement.videoTracks changed.");
+                        test.expectEvent(sourceBuffer.audioTracks, "change", "sourceBuffer.audioTracks changed.");
+                        test.expectEvent(sourceBuffer.videoTracks, "change", "sourceBuffer.videoTracks changed.");
+                        mediaElement.audioTracks[0].enabled = true;
+                        mediaElement.videoTracks[0].selected = true;
+                        test.waitForExpectedEvents(test.step_func_done());
+                    }));
+                }));
+            }, "Change events must be fired on MediaElement and SourceBuffer track lists when enabling/disabling or selecting/deselecting tracks");
+
         </script>
     </body>
 </html>