[Android] Add events_unittests to the default cq/try runs

These tests will soon cover a core portion of Android's touch/gesture pipeline,
and should be run by default accordingly.

BUG=332418

Review URL: https://codereview.chromium.org/180723005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253790 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253790