Add support for Android-EGL creation of protected GL backend contexts

Change-Id: If0c1360fb7b08aec2db3c494eeecea4c21247eb4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/735196
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
4 files changed