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This CL adds JUnit4 to chromium android checkouts. It will be used for
host-side java unit testing. This should allow us to both write new
tests for existing java code and convert some existing device-side
instrumentation tests.

BUG=316383

Review URL: https://codereview.chromium.org/556893004

Cr-Commit-Position: refs/heads/master@{#294966}