MirNativeWindow is the code that allows us to communicate buffers to the driver on android. Currently, we're just using this in our clients so they can use the buffers that they get over ipc, but we will need this code for our own fb native window type (to deprecate 3rd_party/android-fbtype) and for inprocess-egl work on the android side.
Approved by Alexandros Frantzis, PS Jenkins bot.