Allow hw secured codecs on chromecast

media/media_options.gni

Index: media/media_options.gni
diff --git a/media/media_options.gni b/media/media_options.gni
index 21d31d0ee947dbf6b8b5d7da1019b1fd8acb5be8..df20ef8da4823abf0a5c44b1e7389c9861ee5057 100644
--- a/media/media_options.gni
+++ b/media/media_options.gni
@@ -42,6 +42,9 @@ declare_args() {
   # Enable HEVC/H265 demuxing. Actual decoding must be provided by the
   # platform. Enable by default for Chromecast.
   enable_hevc_demuxing = proprietary_codecs && is_chromecast
+
+  # Allow supporting of hardware secured codecs.
+  enable_hw_secure_codec = is_android || is_chromecast
 }
 
 # Use a second declare_args() to pick up possible overrides of |use_cras|.