Add MediaStream.active attribute

LayoutTests/fast/mediastream/MediaStream-add-remove-tracks.html

Index: LayoutTests/fast/mediastream/MediaStream-add-remove-tracks.html
diff --git a/LayoutTests/fast/mediastream/MediaStream-add-remove-tracks.html b/LayoutTests/fast/mediastream/MediaStream-add-remove-tracks.html
index 2ef08db836bd900ef0c33de0c48ae81fc95c9bc3..44969034937349c85b0745f6bcd2043b7e647129 100644
--- a/LayoutTests/fast/mediastream/MediaStream-add-remove-tracks.html
+++ b/LayoutTests/fast/mediastream/MediaStream-add-remove-tracks.html
@@ -9,6 +9,7 @@ description("Test adding and removing tracks.");
 
 var stream1;
 var stream2;
+var stream3;
 var audioTrack;
 var videoTrack;
 
@@ -48,6 +49,23 @@ function shouldNotFire() {
     testFailed("\"addtrack\" or \"removetrack\" events should not fire as a result of local addTrack() or removeTrack() operations.");
 }
 
+function onStreamActive() {
+    testPassed('Stream1 active.');
+}
+
+function onStreamInactive() {
+    testPassed('Stream1 inactive.');
+    setTimeout(finishJSTest, 0);
+}
+
+function gotStream3(s) {
+    stream3 = s;
+    stream1.onactive = onStreamActive;
+    stream1.oninactive = onStreamInactive;
+    tryAddTrack(stream1, stream3.getAudioTracks()[0]);
+    tryRemoveTrack(stream1, stream3.getAudioTracks()[0]);
+}
+
 function gotStream2(s) {
     stream2 = s;
 
@@ -116,17 +134,16 @@ function gotStream2(s) {
     shouldBe('stream1.getVideoTracks().length', '2');
     shouldBe('stream1.getTracks().length', '4');
 
-    // when all tracks have been removed, stream.ended should return true.
+    // when all tracks have been removed, stream.active should return false.
     tryRemoveTrack(stream2, stream2.getAudioTracks()[0]);
     tryRemoveTrack(stream2, stream2.getVideoTracks()[0]);
-    shouldBeTrue('stream2.ended');
-
-    stream1.stop();
+    shouldBeFalse('stream2.active');
 
-    shouldThrow('stream1.addTrack(audioTrack)');
-    shouldThrow('stream1.removeTrack(audioTrack)');
-
-    setTimeout(finishJSTest, 0);
+    for (var i = 0; i < stream1.getAudioTracks().length; i++)
+        stream1.getAudioTracks()[i].stop();
+    for (var i = 0; i < stream1.getVideoTracks().length; i++)
+        stream1.getVideoTracks()[i].stop();
+    getUserMedia({audio:true, video:true}, gotStream3);

[perkj_chrome, 2015/01/13 08:24:31]

shouldBeFalse('stream1.active') ?

[jiajia.qin, 2015/01/13 10:42:30]

Done.

 }
 
 function gotStream1(s) {