MediaRecorder (cleanup): support mime type video/x-matroska and codec=avc1 to the list

third_party/WebKit/LayoutTests/fast/mediarecorder/MediaRecorder-isTypeSupported.html

Index: third_party/WebKit/LayoutTests/fast/mediarecorder/MediaRecorder-isTypeSupported.html
diff --git a/third_party/WebKit/LayoutTests/fast/mediarecorder/MediaRecorder-isTypeSupported.html b/third_party/WebKit/LayoutTests/fast/mediarecorder/MediaRecorder-isTypeSupported.html
index 7b0c985629092efe1e01bee55cd1deea817b505f..ef1b105b010ea5cc4156c7671851351a33be91ec 100644
--- a/third_party/WebKit/LayoutTests/fast/mediarecorder/MediaRecorder-isTypeSupported.html
+++ b/third_party/WebKit/LayoutTests/fast/mediarecorder/MediaRecorder-isTypeSupported.html
@@ -20,6 +20,7 @@ test(function() {
   assert_true(MediaRecorder.isTypeSupported("video/webm;codecs=vp9.0"));
   assert_true(MediaRecorder.isTypeSupported("video/webm;codecs=h264"));
   assert_true(MediaRecorder.isTypeSupported("video/webm;codecs=H264"));
+  assert_true(MediaRecorder.isTypeSupported("video/webm;codecs=avc1"));
   // "video/webm" supports audio codec specification, see
   // http://www.webmproject.org/docs/container/
   assert_true(MediaRecorder.isTypeSupported("video/webm;codecs=vp8,opus"));
@@ -28,6 +29,8 @@ test(function() {
   assert_true(MediaRecorder.isTypeSupported("video/webm;codecs=vp8,vp9,opus"));
   assert_true(MediaRecorder.isTypeSupported("video/webm;codecs=h264,opus"));
   assert_true(MediaRecorder.isTypeSupported("video/webm;codecs=h264,vp9,opus"));
+  // https://matroska.org/technical/specs/notes.html#MIME
+  assert_true(MediaRecorder.isTypeSupported("video/x-matroska;codecs=avc1"));
 }, 'check MediaRecorder.isTypeSupported() with valid video MIME types');
 
 test(function() {