[Android] Add --gtest-filter-file option to the test runner.

This is proving useful for test filters involving >1 test, which I'm
using heavily as I work on the net test server.

BUG=428729

Review URL: https://codereview.chromium.org/892273002

Cr-Commit-Position: refs/heads/master@{#314254}
2 files changed