tree d2c6d6941ea4fd00e2bf8d77dcf7a71e872a3032
parent 94f749aaae272f3b600f4eadb1c1aa1f2bb4e164
author Sen Jiang <senj@google.com> 1463703684 -0700
committer Sen Jiang <senj@google.com> 1464837088 -0700

Add USE_OMAHA flag.

What we really meant when we use ifdef BRILLO in Android.mk is if use
omaha, so this patch introduce a new use flag for omaha.

Bug: 28752785
Test: mma

Change-Id: I4f3a81d953943dd4cd0907c2aabc10a6cb9d6acc