media: Enable Unified Media Pipeline for MSE and EME on Android

media/media_options.gni

Index: media/media_options.gni
diff --git a/media/media_options.gni b/media/media_options.gni
index cedcdf7132793b16af8af32d28b0a981f2d924e6..0390f21a15a06c1c7b8a1850c250f63b38fc3323 100644
--- a/media/media_options.gni
+++ b/media/media_options.gni
@@ -72,7 +72,7 @@ declare_args() {
   # |mojo_media_services|). When enabled, selected mojo paths will be enabled in
   # the media pipeline and corresponding services will hosted in the selected
   # remote process (e.g. "utility" process, see |mojo_media_host|).
-  enable_mojo_media = false
+  enable_mojo_media = is_android
 
   # Enable the TestMojoMediaClient to be used in MojoMediaApplication. This is
   # for testing only and will override the default platform MojoMediaClient.