CreatePlatformGLTestContext_egl:  Try GLES 3, then GLES 2.

Also cleanup.

Change-Id: I186a7d7f509bc7852241c083414495b6182b916c
Reviewed-on: https://skia-review.googlesource.com/115922
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
1 file changed