Add browser test for vp9 subsample encrypted content

content/browser/media/encrypted_media_browsertest.cc

Index: content/browser/media/encrypted_media_browsertest.cc
diff --git a/content/browser/media/encrypted_media_browsertest.cc b/content/browser/media/encrypted_media_browsertest.cc
index bf91942e96ddca25fcd7c1519a589dc940cfce94..619399607d52e447911b0b17726673fbe434ae68 100644
--- a/content/browser/media/encrypted_media_browsertest.cc
+++ b/content/browser/media/encrypted_media_browsertest.cc
@@ -29,6 +29,7 @@ const char kWebMVorbisAudioOnly[] = "audio/webm; codecs=\"vorbis\"";
 #if !defined(DISABLE_ENCRYPTED_MEDIA_PLAYBACK_TESTS)
 const char kWebMOpusAudioOnly[] = "audio/webm; codecs=\"opus\"";
 const char kWebMVP8VideoOnly[] = "video/webm; codecs=\"vp8\"";
+const char kWebMVP9VideoOnly[] = "video/webm; codecs=\"vp9\"";
 const char kWebMOpusAudioVP9Video[] = "video/webm; codecs=\"opus, vp9\"";
 #endif
 const char kWebMVorbisAudioVP8Video[] = "video/webm; codecs=\"vorbis, vp8\"";
@@ -171,6 +172,16 @@ IN_PROC_BROWSER_TEST_P(EncryptedMediaTest, Playback_VideoOnly_WebM) {
   TestSimplePlayback("bear-320x240-v_enc-v.webm", kWebMVP8VideoOnly);
 }
 
+IN_PROC_BROWSER_TEST_P(EncryptedMediaTest, Playback_VideoOnly_WebM_Fullsample) {
+  TestSimplePlayback("bear-320x240-v-vp9_fullsample_enc-v.webm",
+                     kWebMVP9VideoOnly);
+}
+
+IN_PROC_BROWSER_TEST_P(EncryptedMediaTest, Playback_VideoOnly_WebM_Subsample) {
+  TestSimplePlayback("bear-320x240-v-vp9_subsample_enc-v.webm",
+                     kWebMVP9VideoOnly);
+}
+
 IN_PROC_BROWSER_TEST_P(EncryptedMediaTest, Playback_VideoClearAudio_WebM) {
   TestSimplePlayback("bear-320x240-av_enc-v.webm", kWebMVorbisAudioVP8Video);
 }