Add unit tests for revving of Chrome prebuilts.

BUG=chromium:238338
TEST=Verify this unit test is broken by CL:49528
TEST=Verify this unit test is fixed by CL:50182
TEST=All unit tests
Change-Id: I50dfd7398cd13be9302ffba62c92640bfd04940a
Reviewed-on: https://gerrit.chromium.org/gerrit/50183
Tested-by: David James <davidjames@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Ryan Cui <rcui@chromium.org>
Commit-Queue: David James <davidjames@chromium.org>
1 file changed