Adding a few new MSE tests based on the spec.

LayoutTests/http/tests/media/media-source/mediasource-closed.html

Index: LayoutTests/http/tests/media/media-source/mediasource-closed.html
diff --git a/LayoutTests/http/tests/media/media-source/mediasource-closed.html b/LayoutTests/http/tests/media/media-source/mediasource-closed.html
index 13e41bfa9e2f8ab4090842a2944237f5fc0317cd..b70b439d62932d3e5e7b7e6835fa6e1692083b10 100644
--- a/LayoutTests/http/tests/media/media-source/mediasource-closed.html
+++ b/LayoutTests/http/tests/media/media-source/mediasource-closed.html
@@ -36,6 +36,7 @@
                   assert_equals(mediaSource.sourceBuffers.length, 0, "sourceBuffers is empty");
                   assert_equals(mediaSource.activeSourceBuffers.length, 0, "activeSourceBuffers is empty");
                   assert_equals(mediaSource.readyState, "closed", "readyState is 'closed'");
+                  assert_true(Number.isNaN(mediaSource.duration), "duration is NaN");
                   assert_throws("NotFoundError",
                       function() { mediaSource.removeSourceBuffer(sourceBuffer); },
                       "removeSourceBuffer() throws an exception when closed.");
@@ -54,6 +55,22 @@
                   "endOfStream() throws an exception when closed.");
           }, "Test endOfStream() while closed.");
 
+          test(function ()
+          {
+              var mediaSource = new MediaSource();
+              assert_throws("InvalidStateError",
+                  function() { mediaSource.endOfStream("decode"); },
+                  "endOfStream(decode) throws an exception when closed.");
+          }, "Test endOfStream(decode) while closed.");
+
+          test(function ()
+          {
+              var mediaSource = new MediaSource();
+              assert_throws("InvalidStateError",
+                  function() { mediaSource.endOfStream("network"); },
+                  "endOfStream(network) throws an exception when closed.");
+          }, "Test endOfStream(network) while closed.");
+
 
           test(function ()
           {
@@ -63,6 +80,41 @@
                   "Setting duration throws an exception when closed.");
           }, "Test setting duration while closed.");
 
+           mediasource_test(function(test, mediaElement, mediaSource)
+          {
+              var sourceBuffer = mediaSource.addSourceBuffer(MediaSourceUtil.AUDIO_ONLY_TYPE);
+              
+              assert_equals(mediaSource.readyState, "open", "readyState is 'open'");
+              // Setup a handler to run when the MediaSource closes.
+              mediaSource.addEventListener('sourceclose', test.step_func(function (event)
+              {
+                  assert_equals(mediaSource.readyState, "closed", "readyState is 'closed'");
+                  assert_throws("InvalidStateError", 
+                      function() { mediaSource.duration = 10; },
+                      "Setting duration when closed throws an exception");
+                  test.done();
+              }));
+
+              // Trigger the MediaSource to close.
+              mediaElement.src = "";
+          }, "Test setting duration while open->closed.");
+          
+           mediasource_test(function(test, mediaElement, mediaSource)
+          {
+              var sourceBuffer = mediaSource.addSourceBuffer(MediaSourceUtil.AUDIO_ONLY_TYPE);
+              
+              assert_equals(mediaSource.readyState, "open", "readyState is 'open'");
+              // Setup a handler to run when the MediaSource closes.
+              mediaSource.addEventListener('sourceclose', test.step_func(function (event)
+              {
+                  assert_equals(mediaSource.readyState, "closed", "readyState is 'closed'");
+                  assert_true(Number.isNaN(mediaSource.duration), "duration is NaN");                  
+                  test.done();
+              }));
+
+              // Trigger the MediaSource to close.
+              mediaElement.src = "";
+          }, "Test getting duration while open->closed.");
         </script>
     </body>
 </html>