Add perf unit tests to telemetry_UnitTests

Add perf unit tests to telemetry_UnitTests.

Bubble up error to status log, sample error:
  testCacheHandled (measurements.page_cycler_unittest.PageCyclerUnitTest)
  Traceback (most recent call last):
    File "/usr/local/telemetry/src/tools/perf/measurements/page_cycler_unittest.py", line 134, in testCacheHandled
      'warm_times' if i < 3 else 'cold_times')
  AssertionError: 'cold_times' != 'warm_times'

BUG=chromium:323676
TEST=local test_that
 test_that 172.22.75.225 telemetry_UnitTests
verify status log contains trace.

Change-Id: I561c071b6c854f0a8f45d4877a546e15bd01956e
Reviewed-on: https://chromium-review.googlesource.com/178568
Tested-by: Dan Shi <dshi@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Commit-Queue: Dan Shi <dshi@chromium.org>
1 file changed