GrGLES: unify MakeNativeInterface_{android,egl}

BUG=skia:3508
Change-Id: Ibc98ea3e579cb545635c28d345cae24f57d0c2a3
Reviewed-on: https://skia-review.googlesource.com/114471
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
3 files changed