Query LibVPX for VP9 profile support.

media/base/mime_util_internal.cc

Index: media/base/mime_util_internal.cc
diff --git a/media/base/mime_util_internal.cc b/media/base/mime_util_internal.cc
index 9bb409995088b2a0d77ae2bfd2008796b7a5c229..d605cdb835b6b423f1f20f1f7238c0b089e2ecbd 100644
--- a/media/base/mime_util_internal.cc
+++ b/media/base/mime_util_internal.cc
@@ -729,10 +729,19 @@ SupportsType MimeUtil::IsCodecSupported(const std::string& mime_type_lower_case,
         ambiguous_platform_support = true;
     }
   } else if (codec == MimeUtil::VP9 && video_profile != VP9PROFILE_PROFILE0) {
-    // We don't know if the underlying platform supports these profiles. Need
-    // to add platform level querying to get supported profiles.
-    // https://crbug.com/604566
+#if defined(OS_ANDROID)
+    // TODO(chcunningham): Get unambiguous answer for android platform support.
+    // Desktop support is described in calls to media::IsSupportedVideoConfig()
+    // below. In the future Android will use the same path.
+    // https://crbug.com/695264
     ambiguous_platform_support = true;
+#else
+    // TODO(chcunningham): Pass Key System configuration through to MediaClient
+    // to describe support for specific profiles. For now we don't know what
+    // Key System is being used, nor what profile's it supports.
+    // https://crbug.com/604566
+    ambiguous_platform_support = is_encrypted;
+#endif
   }
 
   AudioCodec audio_codec = MimeUtilToAudioCodec(codec);