[Android] Add base_junit_tests to VALID_TESTS in bb_device_steps.
[Android] Add base_junit_tests to VALID_TESTS in bb_device_steps.

Fixes https://codereview.chromium.org/1127153004/

BUG=

Review URL: https://codereview.chromium.org/1135053003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#329220}

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