Query LibVPX for VP9 profile support.

media/base/decode_capabilities.cc

Index: media/base/decode_capabilities.cc
diff --git a/media/base/decode_capabilities.cc b/media/base/decode_capabilities.cc
index 64c32ba1b4e506f373c6ef6d126e173fa885eba3..19765f0de74973c32cba926795a88334d8e3d781 100644
--- a/media/base/decode_capabilities.cc
+++ b/media/base/decode_capabilities.cc
@@ -7,6 +7,7 @@
 #include "base/command_line.h"
 #include "base/feature_list.h"
 #include "media/base/media_switches.h"
+#include "media/filters/vpx_video_decoder.h"
 #include "ui/display/display_switches.h"
 
 namespace media {
@@ -142,7 +143,9 @@ bool IsSupportedVideoConfig(const VideoConfig& config) {
   switch (config.codec) {
     case media::kCodecVP9:
       // Color management required for HDR to not look terrible.
-      return IsColorSpaceSupported(config.color_space);
+      return IsColorSpaceSupported(config.color_space)
+             // VP9 decoding will fall through to LibVPX.
+             && VpxVideoDecoder::IsVideoConfigSupported(config);
 
     case media::kCodecH264:
     case media::kCodecVP8: