MediaStream Recorder: Support VP9 encoder

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

Index: third_party/WebKit/LayoutTests/fast/mediarecorder/MediaRecorder-canRecordMimeType.html
diff --git a/third_party/WebKit/LayoutTests/fast/mediarecorder/MediaRecorder-canRecordMimeType.html b/third_party/WebKit/LayoutTests/fast/mediarecorder/MediaRecorder-canRecordMimeType.html
index aa43a3b86bb198a4218e951ce553358869a70fc8..274379024b85bc7817169a7fd362fcae4a11c204 100644
--- a/third_party/WebKit/LayoutTests/fast/mediarecorder/MediaRecorder-canRecordMimeType.html
+++ b/third_party/WebKit/LayoutTests/fast/mediarecorder/MediaRecorder-canRecordMimeType.html
@@ -2,8 +2,8 @@
 <script src=../../resources/testharness.js></script>
 <script src=../../resources/testharnessreport.js></script>
 <script>
-// Check one Video format that should be recordable and another that should not
-// be. Supported formats return "maybe". Same for Audio.
+// Check the Video formats that should be recordable and one that should not be.
+// Supported formats return "maybe". Same for Audio.
 // https://w3c.github.io/mediacapture-record/MediaRecorder.html#methods
 
 test(function() {
@@ -15,6 +15,10 @@ test(function() {
 }, 'check MediaRecorder.canRecordMimeType() with video/vp8');
 
 test(function() {
+  assert_equals(MediaRecorder.canRecordMimeType("video/vp9"), "maybe");
+}, 'check MediaRecorder.canRecordMimeType() with video/vp9');
+
+test(function() {
   assert_equals(MediaRecorder.canRecordMimeType("audio/invalid"), "");
 }, 'check MediaRecorder.canRecordMimeType() with audio/invalid');