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This CL improves Android Studio support for javatests after
modularization. Since with the new clank structure, we are going to have
javatests and java files in one folder, we can list both of them in one
gradle target as well.

Bug: 620034
Change-Id: I48f6a376c87cb368ded662f868c1c1767755267e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2594770
Commit-Queue: Alice Wang <aliceywang@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837989}