telemetry: Fix startup benchmarks so that all metrics get recorded.

telemetry: Fix startup benchmarks so that all metrics get recorded.

*PERF SHERRIF: if startup benchmarks become red, this CL is to be reverted.

The lack of a page navigation was preventing the metric
Startup.FirstWebContents.NonEmptyPaint from being emitted. The addition of the
RAF logic check is to prevent theoretical race conditions - it may be overkill.

BUG=513364
CQ_EXTRA_TRYBOTS=tryserver.chromium.perf:linux_perf_bisect;tryserver.chromium.perf:mac_perf_bisect;tryserver.chromium.perf:android_nexus5_perf_bisect

Committed: https://crrev.com/0bc400e1c96da5a05379bc1b634ec278f36d3417
Cr-Commit-Position: refs/heads/master@{#347402}

[erikchen, 2015-09-04 01:10:39]

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

[erikchen, 2015-09-04 01:10:39]

nednguyen: Please review.

See https://code.google.com/p/chromium/issues/detail?id=513364#c11 for details
about RAF.

[nednguyen, 2015-09-04 01:36:06]

lgtm

[erikchen, 2015-09-04 01:36:54]

The CQ bit was checked by erikchen@chromium.org

[commit-bot: I haz the power, 2015-09-04 01:37:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1307203006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1307203006/1

[commit-bot: I haz the power, 2015-09-04 01:43:24]

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

[commit-bot: I haz the power, 2015-09-04 01:43:25]

Try jobs failed on following builders:
  ios_rel_device_ninja on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device_ni...)

[erikchen, 2015-09-04 01:54:56]

The CQ bit was checked by erikchen@chromium.org

[commit-bot: I haz the power, 2015-09-04 01:55:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1307203006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1307203006/1

[commit-bot: I haz the power, 2015-09-04 02:01:29]

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

[commit-bot: I haz the power, 2015-09-04 02:01:30]

Try jobs failed on following builders:
  ios_rel_device_ninja on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device_ni...)

[nednguyen, 2015-09-04 02:01:46]

The CQ bit was checked by nednguyen@google.com

[commit-bot: I haz the power, 2015-09-04 02:02:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1307203006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1307203006/1

[commit-bot: I haz the power, 2015-09-04 02:06:32]

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

[commit-bot: I haz the power, 2015-09-04 02:06:33]

Try jobs failed on following builders:
  ios_dbg_simulator_ninja on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_dbg_simulator...)
  ios_rel_device_ninja on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device_ni...)

[nednguyen, 2015-09-04 05:07:21]

The CQ bit was checked by nednguyen@google.com

[commit-bot: I haz the power, 2015-09-04 05:07:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1307203006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1307203006/1

[commit-bot: I haz the power, 2015-09-04 12:50:12]

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

[commit-bot: I haz the power, 2015-09-04 12:50:13]

Try jobs failed on following builders:
  win_perf_bisect on tryserver.chromium.perf (JOB_TIMED_OUT,
http://build.chromium.org/p/tryserver.chromium.perf/builders/win_perf_bisect/...)

[nednguyen, 2015-09-04 13:27:11]

The CQ bit was checked by nednguyen@google.com

[commit-bot: I haz the power, 2015-09-04 13:27:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1307203006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1307203006/1

[nednguyen, 2015-09-04 14:30:15]

On 2015/09/04 13:27:34, commit-bot: I haz the power wrote:
> CQ is trying da patch. Follow status at
>  https://chromium-cq-status.appspot.com/patch-status/1307203006/1
> View timeline at
>  https://chromium-cq-status.appspot.com/patch-timeline/1307203006/1

I removed win_perf_bisect from the list of CQ_EXTRA_TRYBOTS.

[commit-bot: I haz the power, 2015-09-04 14:31:59]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-04 14:32:46]

Patchset 1 (id:??) landed as
https://crrev.com/0bc400e1c96da5a05379bc1b634ec278f36d3417
Cr-Commit-Position: refs/heads/master@{#347402}

[erikchen, 2015-11-10 22:15:52]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1438533003/ by erikchen@chromium.org.

The reason for reverting is: Theoretically, these changes should no longer be
required, now that https://code.google.com/p/chromium/issues/detail?id=529340#c7
has landed..