[Ozone] Update GYP and GN to include a DRM platform

media/ozone/media_ozone_platform.cc

Index: media/ozone/media_ozone_platform.cc
diff --git a/media/ozone/media_ozone_platform.cc b/media/ozone/media_ozone_platform.cc
index aaf00abcd61fe5b11f5f9bc8d9176e799b332e30..dcbc2f250168ae75d779567469f50083d962f472 100644
--- a/media/ozone/media_ozone_platform.cc
+++ b/media/ozone/media_ozone_platform.cc
@@ -36,6 +36,10 @@ MediaOzonePlatform* CreateMediaOzonePlatformDri() {
   return new MediaOzonePlatformStub;
 }
 
+MediaOzonePlatform* CreateMediaOzonePlatformDrm() {
+  return new MediaOzonePlatformStub;
+}
+
 MediaOzonePlatform* CreateMediaOzonePlatformEgltest() {
   return new MediaOzonePlatformStub;
 }