HTMLMediaElement capture: teach the captured MStream to follow up source events

third_party/WebKit/LayoutTests/fast/mediacapturefromelement/HTMLMediaElementCapture-capture.html

Index: third_party/WebKit/LayoutTests/fast/mediacapturefromelement/HTMLMediaElementCapture-capture.html
diff --git a/third_party/WebKit/LayoutTests/fast/mediacapturefromelement/HTMLMediaElementCapture-capture.html b/third_party/WebKit/LayoutTests/fast/mediacapturefromelement/HTMLMediaElementCapture-capture.html
index 420e3959309daaa64ecc43883bf7c8f59c4d7032..65d9d5cd580ecfa9709bede93f89b70e88c9f137 100644
--- a/third_party/WebKit/LayoutTests/fast/mediacapturefromelement/HTMLMediaElementCapture-capture.html
+++ b/third_party/WebKit/LayoutTests/fast/mediacapturefromelement/HTMLMediaElementCapture-capture.html
@@ -10,21 +10,19 @@ var makeAsyncTest = function(filename) {
     var video = document.createElement('video');
     video.src = "../../http/tests/media/resources/media-source/webm/" + filename;
     video.onerror = this.unreached_func("<video> error");
+    video.play();
 
-    video.onloadedmetadata = this.step_func(function() {
-      var stream = video.captureStream();
+    var stream = video.captureStream();
+
+    // onactive event is marked for deprecation (https://crbug.com/649328)
+    stream.onactive = this.step_func_done(function() {
       var recorder = new MediaRecorder(stream);
         recorder.ondataavailable = test.step_func_done(function(event) {
             assert_true(event.data.size > 0, 'Recorded data size should be > 0');
       });
-
       recorder.start(0);
-      video.play();
-
     });
-
-    video.load();
-  }), "<video>.captureStream() and assert data flows.";
+ }), "<video>.captureStream() and assert data flows.";
 };
 
 generate_tests(makeAsyncTest, [