Run mojo_common_unittests on Android GN.
Run mojo_common_unittests on Android GN.

Run the this on the main waterfall Android GN (rel) bot.
http://build.chromium.org/p/chromium.linux/builders/Android%20GN

Why mojo_common_unittests over base_unittests?
  - base fails 193 tests; mojo_common passed all tests.
  - base takes 382 seconds; mojo_common takes 16 seconds.
  - base isn't yet built; mojo_common is in mandoline:all.

BUG=359249,387724
R=dpranke@chromium.org
TEST=Android GN bot passes the new step.

Review URL: https://codereview.chromium.org/1194453003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#334965}

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