This dramatically speeds up Android shards that use batches of
hudreds of tests. Because ANGLE already has the test list, it no
longer needs to call GTest with an enourmous gtest_filter.

Bug: angleproject:5164
Change-Id: I28fee2f36c50006f2a35a4dcd90f44f8ebe4f78c
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2468464
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>