crosperf: fix unittest for crosperf.

This fixes several issues for unittesting.
Now unittest seems to be working.

BUG=None
TEST=crosperf/run_tests.sh passes.

Change-Id: I1dcef7ba55d45fbd00e453f749a8b10dea0332e6
Reviewed-on: https://chrome-internal-review.googlesource.com/145635
Reviewed-by: Caroline Tice <cmtice@google.com>
Commit-Queue: Yunlian Jiang <yunlian@google.com>
Tested-by: Yunlian Jiang <yunlian@google.com>
6 files changed