[Oilpan] Re-enable OilpanGCTimes performance tests.

Re-enable OilpanGCTimes performance tests.

This CL is a part of revert for https://codereview.chromium.org/837573002
Tests were fixed with https://codereview.chromium.org/818653004

BUG=446301
TBR=tonyg
TESTS=./tools/perf/run_tests --browser=content-shell-release OilpanGCTimesTest

Committed: https://crrev.com/d7b4c057f3377c99bd484e58af4a1826a2e9688c
Cr-Commit-Position: refs/heads/master@{#310244}

[peria, 2015-01-07 06:02:43]

peria@chromium.org changed reviewers:
+ oilpan-reviews@chromium.org

[peria, 2015-01-07 06:02:43]

PTL

[kouhei (in TOK), 2015-01-07 06:03:13]

kouhei@chromium.org changed reviewers:
+ kouhei@chromium.org

[kouhei (in TOK), 2015-01-07 06:03:13]

lgtm

[peria, 2015-01-07 06:04:21]

peria@chromium.org changed reviewers:
+ tonyg@chromium.org

[peria, 2015-01-07 06:04:32]

The CQ bit was checked by peria@chromium.org

[commit-bot: I haz the power, 2015-01-07 06:05:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/815213003/1

[commit-bot: I haz the power, 2015-01-07 07:02:18]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-07 07:03:05]

Patchset 1 (id:??) landed as
https://crrev.com/d7b4c057f3377c99bd484e58af4a1826a2e9688c
Cr-Commit-Position: refs/heads/master@{#310244}

[haraken, 2015-01-07 07:18:44]

LGTM