Android buildbot: Add missing @@@ echo to 'bb_run_unit_tests'
Android buildbot: Add missing @@@ echo to 'bb_run_unit_tests'

Without this, a failure in this function is mistakenly reported
as a failure in the previous bb_xxxxx function called. For example,
see the following link where the failure is reported in
'bb_reboot_phones' when it should not:

http://build.chromium.org/p/chromium.linux/builders/Android%20Tests/builds/23/steps/Rebooting%20phones/logs/stdio

BUG=none
NOTRY=true
TBR=yfriedman@chromium.org,ilevy@chromium.org


Review URL: https://chromiumcodereview.appspot.com/11648009

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@173895 0039d316-1c4b-4281-b951-d872f2087c98

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