Make sure that tracing is always cleaned up for v8_gc_times page_test

Make sure that tracing is always cleaned up for v8_gc_times page_test

BUG=491104
CQ_EXTRA_TRYBOTS=tryserver.chromium.perf:linux_perf_bisect;tryserver.chromium.perf:mac_perf_bisect;tryserver.chromium.perf:win_perf_bisect;tryserver.chromium.perf:android_nexus5_perf_bisect

Committed: https://crrev.com/1d1d10c687de9424db5a66a89d179f11784d7ee8
Cr-Commit-Position: refs/heads/master@{#331590}

[nednguyen, 2015-05-22 20:56:31]

nednguyen@google.com changed reviewers:
+ rmcilroy@chromium.org, sullivan@chromium.org

[nednguyen, 2015-05-22 20:57:09]

On 2015/05/22 20:56:31, nednguyen wrote:

This is another reason of why writing a new page_test is tricky and we should
double down on using TBM.

[sullivan, 2015-05-22 20:58:59]

lgtm

[nednguyen, 2015-05-22 20:59:51]

The CQ bit was checked by nednguyen@google.com

[commit-bot: I haz the power, 2015-05-22 21:01:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1151933005/1

[commit-bot: I haz the power, 2015-05-22 21:13:13]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-05-22 21:13:14]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED, no build URL)
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_FAILED, no build URL)
  android_nexus5_perf_bisect on tryserver.chromium.perf (JOB_FAILED, no build
URL)
  linux_perf_bisect on tryserver.chromium.perf (JOB_FAILED, no build URL)
  mac_perf_bisect on tryserver.chromium.perf (JOB_FAILED, no build URL)
  win_perf_bisect on tryserver.chromium.perf (JOB_FAILED, no build URL)

[nednguyen, 2015-05-22 21:20:36]

nednguyen@google.com changed reviewers:
+ prasadv@chromium.org

[nednguyen, 2015-05-22 21:20:36]

+prasadv: helppp on the bisect bots!!

[rmcilroy, 2015-05-22 22:10:22]

Lgtm, thanks.

[nednguyen, 2015-05-22 22:16:59]

The CQ bit was checked by nednguyen@google.com

[nednguyen, 2015-05-22 22:16:59]

The patchset sent to the CQ was uploaded after l-g-t-m from
sullivan@chromium.org, rmcilroy@chromium.org
Link to the patchset: https://codereview.chromium.org/1151933005/#ps20001
(title: "Fix unittest")

[commit-bot: I haz the power, 2015-05-22 22:19:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1151933005/20001

[commit-bot: I haz the power, 2015-05-22 22:29:29]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-05-22 22:29:30]

Try jobs failed on following builders:
  android_arm64_dbg_recipe on tryserver.chromium.linux (JOB_FAILED, no build
URL)
  android_chromium_gn_compile_dbg on tryserver.chromium.linux (JOB_FAILED, no
build URL)
  android_chromium_gn_compile_rel on tryserver.chromium.linux (JOB_FAILED, no
build URL)
  android_clang_dbg_recipe on tryserver.chromium.linux (JOB_FAILED, no build
URL)
  android_compile_dbg on tryserver.chromium.linux (JOB_FAILED, no build URL)
  cast_shell_android on tryserver.chromium.linux (JOB_FAILED, no build URL)
  cast_shell_linux on tryserver.chromium.linux (JOB_FAILED, no build URL)
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED, no build URL)
  linux_android_rel_ng on tryserver.chromium.linux (JOB_FAILED, no build URL)
  linux_chromium_asan_rel_ng on tryserver.chromium.linux (JOB_FAILED, no build
URL)
  linux_chromium_chromeos_compile_dbg_ng on tryserver.chromium.linux
(JOB_FAILED, no build URL)
  linux_chromium_chromeos_ozone_rel_ng on tryserver.chromium.linux (JOB_FAILED,
no build URL)
  linux_chromium_chromeos_rel_ng on tryserver.chromium.linux (JOB_FAILED, no
build URL)
  linux_chromium_clobber_rel_ng on tryserver.chromium.linux (JOB_FAILED, no
build URL)
  linux_chromium_compile_dbg_32_ng on tryserver.chromium.linux (JOB_FAILED, no
build URL)
  linux_chromium_gn_chromeos_rel on tryserver.chromium.linux (JOB_FAILED, no
build URL)
  linux_chromium_gn_dbg on tryserver.chromium.linux (JOB_FAILED, no build URL)
  linux_chromium_gn_rel on tryserver.chromium.linux (JOB_FAILED, no build URL)
  linux_chromium_rel_ng on tryserver.chromium.linux (JOB_FAILED, no build URL)
  ios_dbg_simulator_ninja on tryserver.chromium.mac (JOB_FAILED, no build URL)
  ios_rel_device_ninja on tryserver.chromium.mac (JOB_FAILED, no build URL)
  mac_chromium_compile_dbg_ng on tryserver.chromium.mac (JOB_FAILED, no build
URL)
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_FAILED, no build URL)
  android_nexus5_perf_bisect on tryserver.chromium.perf (JOB_FAILED, no build
URL)
  linux_perf_bisect on tryserver.chromium.perf (JOB_FAILED, no build URL)
  mac_perf_bisect on tryserver.chromium.perf (JOB_FAILED, no build URL)
  win_perf_bisect on tryserver.chromium.perf (JOB_FAILED, no build URL)
  win8_chromium_rel on tryserver.chromium.win (JOB_FAILED, no build URL)
  win_chromium_compile_dbg_ng on tryserver.chromium.win (JOB_FAILED, no build
URL)
  win_chromium_rel_ng on tryserver.chromium.win (JOB_FAILED, no build URL)
  win_chromium_x64_rel_ng on tryserver.chromium.win (JOB_FAILED, no build URL)

[nednguyen, 2015-05-23 12:01:52]

The CQ bit was checked by nednguyen@google.com

[commit-bot: I haz the power, 2015-05-23 12:02:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1151933005/20001

[commit-bot: I haz the power, 2015-05-23 12:03:28]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-05-23 12:03:29]

Try jobs failed on following builders:
  android_arm64_dbg_recipe on tryserver.chromium.linux (JOB_FAILED, no build
URL)
  android_chromium_gn_compile_dbg on tryserver.chromium.linux (JOB_FAILED, no
build URL)
  android_chromium_gn_compile_rel on tryserver.chromium.linux (JOB_FAILED, no
build URL)
  android_clang_dbg_recipe on tryserver.chromium.linux (JOB_FAILED, no build
URL)
  android_compile_dbg on tryserver.chromium.linux (JOB_FAILED, no build URL)
  cast_shell_android on tryserver.chromium.linux (JOB_FAILED, no build URL)
  cast_shell_linux on tryserver.chromium.linux (JOB_FAILED, no build URL)
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED, no build URL)
  linux_android_rel_ng on tryserver.chromium.linux (JOB_FAILED, no build URL)
  linux_chromium_asan_rel_ng on tryserver.chromium.linux (JOB_FAILED, no build
URL)
  linux_chromium_chromeos_compile_dbg_ng on tryserver.chromium.linux
(JOB_FAILED, no build URL)
  linux_chromium_chromeos_ozone_rel_ng on tryserver.chromium.linux (JOB_FAILED,
no build URL)
  linux_chromium_chromeos_rel_ng on tryserver.chromium.linux (JOB_FAILED, no
build URL)
  linux_chromium_clobber_rel_ng on tryserver.chromium.linux (JOB_FAILED, no
build URL)
  linux_chromium_compile_dbg_32_ng on tryserver.chromium.linux (JOB_FAILED, no
build URL)
  linux_chromium_gn_chromeos_rel on tryserver.chromium.linux (JOB_FAILED, no
build URL)
  linux_chromium_gn_dbg on tryserver.chromium.linux (JOB_FAILED, no build URL)
  linux_chromium_gn_rel on tryserver.chromium.linux (JOB_FAILED, no build URL)
  linux_chromium_rel_ng on tryserver.chromium.linux (JOB_FAILED, no build URL)
  ios_dbg_simulator_ninja on tryserver.chromium.mac (JOB_FAILED, no build URL)
  ios_rel_device_ninja on tryserver.chromium.mac (JOB_FAILED, no build URL)
  mac_chromium_compile_dbg_ng on tryserver.chromium.mac (JOB_FAILED, no build
URL)
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_FAILED, no build URL)
  android_nexus5_perf_bisect on tryserver.chromium.perf (JOB_FAILED, no build
URL)
  linux_perf_bisect on tryserver.chromium.perf (JOB_FAILED, no build URL)
  mac_perf_bisect on tryserver.chromium.perf (JOB_FAILED, no build URL)
  win_perf_bisect on tryserver.chromium.perf (JOB_FAILED, no build URL)
  win8_chromium_rel on tryserver.chromium.win (JOB_FAILED, no build URL)
  win_chromium_compile_dbg_ng on tryserver.chromium.win (JOB_FAILED, no build
URL)
  win_chromium_rel_ng on tryserver.chromium.win (JOB_FAILED, no build URL)
  win_chromium_x64_rel_ng on tryserver.chromium.win (JOB_FAILED, no build URL)

[nednguyen, 2015-05-25 03:34:53]

The CQ bit was checked by nednguyen@google.com

[commit-bot: I haz the power, 2015-05-25 03:35:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1151933005/20001

[commit-bot: I haz the power, 2015-05-25 03:36:52]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-05-25 03:36:55]

Try jobs failed on following builders:
  android_arm64_dbg_recipe on tryserver.chromium.linux (JOB_FAILED, no build
URL)
  android_chromium_gn_compile_dbg on tryserver.chromium.linux (JOB_FAILED, no
build URL)
  android_chromium_gn_compile_rel on tryserver.chromium.linux (JOB_FAILED, no
build URL)
  android_clang_dbg_recipe on tryserver.chromium.linux (JOB_FAILED, no build
URL)
  android_compile_dbg on tryserver.chromium.linux (JOB_FAILED, no build URL)
  cast_shell_android on tryserver.chromium.linux (JOB_FAILED, no build URL)
  cast_shell_linux on tryserver.chromium.linux (JOB_FAILED, no build URL)
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED, no build URL)
  linux_android_rel_ng on tryserver.chromium.linux (JOB_FAILED, no build URL)
  linux_chromium_asan_rel_ng on tryserver.chromium.linux (JOB_FAILED, no build
URL)
  linux_chromium_chromeos_compile_dbg_ng on tryserver.chromium.linux
(JOB_FAILED, no build URL)
  linux_chromium_chromeos_ozone_rel_ng on tryserver.chromium.linux (JOB_FAILED,
no build URL)
  linux_chromium_chromeos_rel_ng on tryserver.chromium.linux (JOB_FAILED, no
build URL)
  linux_chromium_clobber_rel_ng on tryserver.chromium.linux (JOB_FAILED, no
build URL)
  linux_chromium_compile_dbg_32_ng on tryserver.chromium.linux (JOB_FAILED, no
build URL)
  linux_chromium_gn_chromeos_rel on tryserver.chromium.linux (JOB_FAILED, no
build URL)
  linux_chromium_gn_dbg on tryserver.chromium.linux (JOB_FAILED, no build URL)
  linux_chromium_gn_rel on tryserver.chromium.linux (JOB_FAILED, no build URL)
  linux_chromium_rel_ng on tryserver.chromium.linux (JOB_FAILED, no build URL)
  ios_dbg_simulator_ninja on tryserver.chromium.mac (JOB_FAILED, no build URL)
  ios_rel_device_ninja on tryserver.chromium.mac (JOB_FAILED, no build URL)
  mac_chromium_compile_dbg_ng on tryserver.chromium.mac (JOB_FAILED, no build
URL)
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_FAILED, no build URL)
  android_nexus5_perf_bisect on tryserver.chromium.perf (JOB_FAILED, no build
URL)
  linux_perf_bisect on tryserver.chromium.perf (JOB_FAILED, no build URL)
  mac_perf_bisect on tryserver.chromium.perf (JOB_FAILED, no build URL)
  win_perf_bisect on tryserver.chromium.perf (JOB_FAILED, no build URL)
  win8_chromium_rel on tryserver.chromium.win (JOB_FAILED, no build URL)
  win_chromium_compile_dbg_ng on tryserver.chromium.win (JOB_FAILED, no build
URL)
  win_chromium_rel_ng on tryserver.chromium.win (JOB_FAILED, no build URL)
  win_chromium_x64_rel_ng on tryserver.chromium.win (JOB_FAILED, no build URL)

[nednguyen, 2015-05-25 17:11:47]

The CQ bit was checked by nednguyen@google.com

[nednguyen, 2015-05-25 17:11:47]

The patchset sent to the CQ was uploaded after l-g-t-m from
sullivan@chromium.org, rmcilroy@chromium.org
Link to the patchset: https://codereview.chromium.org/1151933005/#ps40001
(title: "Rebase")

[commit-bot: I haz the power, 2015-05-25 17:11:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1151933005/40001

[commit-bot: I haz the power, 2015-05-25 17:13:29]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-05-25 17:13:30]

Try jobs failed on following builders:
  android_arm64_dbg_recipe on tryserver.chromium.linux (JOB_FAILED, no build
URL)
  android_chromium_gn_compile_dbg on tryserver.chromium.linux (JOB_FAILED, no
build URL)
  android_chromium_gn_compile_rel on tryserver.chromium.linux (JOB_FAILED, no
build URL)
  android_clang_dbg_recipe on tryserver.chromium.linux (JOB_FAILED, no build
URL)
  android_compile_dbg on tryserver.chromium.linux (JOB_FAILED, no build URL)
  cast_shell_android on tryserver.chromium.linux (JOB_FAILED, no build URL)
  cast_shell_linux on tryserver.chromium.linux (JOB_FAILED, no build URL)
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED, no build URL)
  linux_android_rel_ng on tryserver.chromium.linux (JOB_FAILED, no build URL)
  linux_chromium_asan_rel_ng on tryserver.chromium.linux (JOB_FAILED, no build
URL)
  linux_chromium_chromeos_compile_dbg_ng on tryserver.chromium.linux
(JOB_FAILED, no build URL)
  linux_chromium_chromeos_ozone_rel_ng on tryserver.chromium.linux (JOB_FAILED,
no build URL)
  linux_chromium_chromeos_rel_ng on tryserver.chromium.linux (JOB_FAILED, no
build URL)
  linux_chromium_clobber_rel_ng on tryserver.chromium.linux (JOB_FAILED, no
build URL)
  linux_chromium_compile_dbg_32_ng on tryserver.chromium.linux (JOB_FAILED, no
build URL)
  linux_chromium_gn_chromeos_rel on tryserver.chromium.linux (JOB_FAILED, no
build URL)
  linux_chromium_gn_dbg on tryserver.chromium.linux (JOB_FAILED, no build URL)
  linux_chromium_gn_rel on tryserver.chromium.linux (JOB_FAILED, no build URL)
  linux_chromium_rel_ng on tryserver.chromium.linux (JOB_FAILED, no build URL)
  ios_dbg_simulator_ninja on tryserver.chromium.mac (JOB_FAILED, no build URL)
  ios_rel_device_ninja on tryserver.chromium.mac (JOB_FAILED, no build URL)
  mac_chromium_compile_dbg_ng on tryserver.chromium.mac (JOB_FAILED, no build
URL)
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_FAILED, no build URL)
  android_nexus5_perf_bisect on tryserver.chromium.perf (JOB_FAILED, no build
URL)
  linux_perf_bisect on tryserver.chromium.perf (JOB_FAILED, no build URL)
  mac_perf_bisect on tryserver.chromium.perf (JOB_FAILED, no build URL)
  win_perf_bisect on tryserver.chromium.perf (JOB_FAILED, no build URL)
  win8_chromium_rel on tryserver.chromium.win (JOB_FAILED, no build URL)
  win_chromium_compile_dbg_ng on tryserver.chromium.win (JOB_FAILED, no build
URL)
  win_chromium_rel_ng on tryserver.chromium.win (JOB_FAILED, no build URL)
  win_chromium_x64_rel_ng on tryserver.chromium.win (JOB_FAILED, no build URL)

[nednguyen, 2015-05-26 14:45:06]

The CQ bit was checked by nednguyen@google.com

[commit-bot: I haz the power, 2015-05-26 14:45:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1151933005/40001

[commit-bot: I haz the power, 2015-05-26 14:52:24]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-05-26 14:52:25]

Try jobs failed on following builders:
  win8_chromium_rel on tryserver.chromium.win (JOB_FAILED, no build URL)
  win_chromium_compile_dbg_ng on tryserver.chromium.win (JOB_FAILED, no build
URL)
  win_chromium_rel_ng on tryserver.chromium.win (JOB_FAILED, no build URL)
  win_chromium_x64_rel_ng on tryserver.chromium.win (JOB_FAILED, no build URL)

[nednguyen, 2015-05-26 15:22:20]

The CQ bit was checked by nednguyen@google.com

[commit-bot: I haz the power, 2015-05-26 15:22:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1151933005/40001

[commit-bot: I haz the power, 2015-05-26 15:29:39]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-05-26 15:29:40]

Try jobs failed on following builders:
  mac_perf_bisect on tryserver.chromium.perf (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.perf/builders/mac_perf_bisect/...)
  win8_chromium_rel on tryserver.chromium.win (JOB_FAILED, no build URL)
  win_chromium_compile_dbg_ng on tryserver.chromium.win (JOB_FAILED, no build
URL)
  win_chromium_rel_ng on tryserver.chromium.win (JOB_FAILED, no build URL)
  win_chromium_x64_rel_ng on tryserver.chromium.win (JOB_FAILED, no build URL)

[nednguyen, 2015-05-26 15:44:00]

The CQ bit was checked by nednguyen@google.com

[commit-bot: I haz the power, 2015-05-26 15:44:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1151933005/40001

[commit-bot: I haz the power, 2015-05-26 19:50:13]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-05-26 19:50:15]

Try jobs failed on following builders:
  win_chromium_x64_rel_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_...)

[nednguyen, 2015-05-27 15:38:08]

The CQ bit was checked by nednguyen@google.com

[nednguyen, 2015-05-27 15:38:08]

The patchset sent to the CQ was uploaded after l-g-t-m from
sullivan@chromium.org, rmcilroy@chromium.org
Link to the patchset: https://codereview.chromium.org/1151933005/#ps60001
(title: "Fix unittest")

[commit-bot: I haz the power, 2015-05-27 15:38:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1151933005/60001

[commit-bot: I haz the power, 2015-05-27 17:02:42]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2015-05-27 17:03:53]

Patchset 4 (id:??) landed as
https://crrev.com/1d1d10c687de9424db5a66a89d179f11784d7ee8
Cr-Commit-Position: refs/heads/master@{#331590}

[samuong, 2015-05-27 22:10:56]

A revert of this CL (patchset #4 id:60001) has been created in
https://codereview.chromium.org/1147093008/ by samuong@chromium.org.

The reason for reverting is: I suspect this is causing failures on
telemetry_perf_unittests - see
https://build.chromium.org/p/chromium.win/builders/XP%20Tests%20%281%29 build
#37836 and later.