In order to support multiple ANGLE builds (Google-signed,
AOSP unsigned, OEM-signed), we will use intent-filter to
indicate that ANGLE is installed.   During CTS testing,
we will verify that only a single ANGLE is installed and
provides the necessary functionality.

Bug: angleproject:3011
Test: Verify CTS hostside tests pass.
Change-Id: I71dc3a32a4c2bd57b4bbff30bd640e7f7704ab32
Reviewed-on: https://chromium-review.googlesource.com/c/1377610
Commit-Queue: Tim Van Patten <timvp@google.com>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Ian Elliott <ianelliott@google.com>