... to support using ANGLE as a native GL driver.

Note: this will not affect devices installing the APK with
`PRODUCT_PACKAGES += ANGLE` and will *not* also install the
libs to vendor.

Bug: b/147316305
Bug: angleproject:5456
Test: ./scripts/roll_aosp.sh and build in AOSP
Change-Id: I98cab8d0735a4f66293ac063e0eef2ae7ddbee7b
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2618529Reviewed-by: Tim Van Patten <timvp@google.com>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Tim Van Patten <timvp@google.com>