If last build failed, try the build again.
If last build failed, try the build again.

BUG=chromium-os:28768
TEST=Ran unit tests.
TBR=sosa

Change-Id: Ib390c5d678e50c2850ff8bf93bf6f81d6c8b2a2a
Reviewed-on: https://gerrit.chromium.org/gerrit/19418
Reviewed-by: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>
Tested-by: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>

zhang0137/chromite,coreos/chromite,bpsinc-native/src_third_party_chromite,coreos/chromite,chadversary/chromiumos.chromite,bpsinc-native/src_third_party_chromite,chadversary/chromiumos.chromite,bpsinc-native/src_third_party_chromite,zhang0137/chromite,zhang0137/chromite,coreos/chromite