generate_gradle.py: Allow for multiple test entries.

It is possible for multiple test entries to correspond to a single
non-test entry.

Bug: 620034
Change-Id: I21bf4c5ff4dbe374f6ced0876222e745a30eaf27
Reviewed-on: https://chromium-review.googlesource.com/839888
Reviewed-by: Peter Wen <wnwen@chromium.org>
Commit-Queue: Eric Stevenson <estevenson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#525831}
2 files changed