MediaStream API: Changing the device enumeration to be async

LayoutTests/fast/mediastream/MediaStreamTrack-getSourceInfos.html

Index: LayoutTests/fast/mediastream/MediaStreamTrack-getSourceInfos.html
diff --git a/LayoutTests/fast/mediastream/MediaStreamTrack-getSourceInfos.html b/LayoutTests/fast/mediastream/MediaStreamTrack-getSourceInfos.html
index a4f7ad1229df0aa98080178acfc7abadf32534eb..d92745fbf7a9f439a54cf2521f68423bbf422304 100644
--- a/LayoutTests/fast/mediastream/MediaStreamTrack-getSourceInfos.html
+++ b/LayoutTests/fast/mediastream/MediaStreamTrack-getSourceInfos.html
@@ -27,19 +27,32 @@ function getUserMedia(constraints, callback) {
     }
 }
 
-function gotStream(s) {
-    shouldNotThrow('sources = MediaStreamTrack.getSourceInfos();');
+function gotSourceInfos2(s) {
+    testPassed('gotSourceInfos2 was called.');
+    sources = s;
     shouldBeTrue('sources.length > 0');
     shouldBeTrue('sources[0].id === previousId');
     shouldBeTrue('sources[0].label.length > 0');
+
     finishJSTest();
 }
 
-shouldNotThrow('sources = MediaStreamTrack.getSourceInfos();');
-shouldBeTrue('sources.length > 0');
-previousId = sources[0].id;
+function gotStream(s) {
+    testPassed('gotStream was called.');
+
+    shouldNotThrow('MediaStreamTrack.getSources(gotSourceInfos2);');
+}
+
+function gotSourceInfos1(s) {
+    testPassed('gotSourceInfos1 was called.');
+    sources = s;
+    shouldBeTrue('sources.length > 0');
+    previousId = sources[0].id;
+
+    getUserMedia({audio:true, video:true}, gotStream);
+}
 
-getUserMedia({audio:true, video:true}, gotStream);
+shouldNotThrow('MediaStreamTrack.getSources(gotSourceInfos1);');
 
 window.jsTestIsAsync = true;
 window.successfullyParsed = true;