The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/toolchain-utils/+/2639395908b32e4560b3b9a5290db08ae819f8e9

commit 2639395908b32e4560b3b9a5290db08ae819f8e9
Author: Zhizhou Yang <zhizhouy@google.com>
Date: Sun Dec 30 02:18:11 2018

crosperf: unit test for CPU cycles table generator

This patch added unit test for CPU table generation in tabulator.py

TEST=passed all unit tests in cros_utils and crosperf
BUG= chromium:917484 
CQ-DEPEND=CL:1389035

Change-Id: Ib10bea1470fca1c5dbab8ad39b9684dd473a6183
Reviewed-on: https://chromium-review.googlesource.com/1392428
Commit-Ready: Zhizhou Yang <zhizhouy@google.com>
Tested-by: Zhizhou Yang <zhizhouy@google.com>
Reviewed-by: Luis Lozano <llozano@chromium.org>

[modify] https://crrev.com/2639395908b32e4560b3b9a5290db08ae819f8e9/cros_utils/tabulator_test.py