Switch chrome.csi() to use times from WebPerformance.

Switch chrome.csi() to use times from WebPerformance.

This is a follow on change to https://codereview.chromium.org/2084583002
which converted chrome.loadTimes() to use WebPerformance-based timings.

The current chrome.csi() implementation uses the unsupported
DocumentState-based metrics. startE, which is derived from
DocumentState.request_time, has sometimes been reporting invalid
values for the last 12 months due to crbug.com/615781. This change
moves us to using data from a trusted/maintained/accurate data source.

This change will also allow us to remove a few timing fields from
DocumentState as part of a subsequent change.

BUG=621512
Committed: https://crrev.com/a2b3e8c87b3f3372fc50ebd8a5e249995d1402ea
Cr-Commit-Position: refs/heads/master@{#429018}

[Bryan McQuade, 2016-10-28 18:48:13]

The CQ bit was checked by bmcquade@chromium.org to run a CQ dry run

[Bryan McQuade, 2016-10-28 18:48:46]

bmcquade@chromium.org changed reviewers:
+ pmeenan@chromium.org

[commit-bot: I haz the power, 2016-10-28 18:48:48]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Bryan McQuade, 2016-10-28 18:50:37]

Description was changed from

==========
Switch chrome.csi() to use times from WebPerformance.

This is a follow on change to https://codereview.chromium.org/2084583002
which converted chrome.loadTimes() to use WebPerformance-based timings.

BUG=621512
==========

to

==========
Switch chrome.csi() to use times from WebPerformance.

This is a follow on change to https://codereview.chromium.org/2084583002
which converted chrome.loadTimes() to use WebPerformance-based timings.

The current chrome.csi() implementation uses the unsupported
DocumentState-based metrics. startE, which is derived from
DocumentState.request_time, has sometimes been reporting invalid
values for the last 12 months due to crbug.com/615781. This change
moves us to using data from a trusted/maintained/accurate data source.

BUG=621512
==========

[Bryan McQuade, 2016-10-28 18:50:47]

PTAL, thanks!

[Bryan McQuade, 2016-10-28 19:04:44]

Description was changed from

==========
Switch chrome.csi() to use times from WebPerformance.

This is a follow on change to https://codereview.chromium.org/2084583002
which converted chrome.loadTimes() to use WebPerformance-based timings.

The current chrome.csi() implementation uses the unsupported
DocumentState-based metrics. startE, which is derived from
DocumentState.request_time, has sometimes been reporting invalid
values for the last 12 months due to crbug.com/615781. This change
moves us to using data from a trusted/maintained/accurate data source.

BUG=621512
==========

to

==========
Switch chrome.csi() to use times from WebPerformance.

This is a follow on change to https://codereview.chromium.org/2084583002
which converted chrome.loadTimes() to use WebPerformance-based timings.

The current chrome.csi() implementation uses the unsupported
DocumentState-based metrics. startE, which is derived from
DocumentState.request_time, has sometimes been reporting invalid
values for the last 12 months due to crbug.com/615781. This change
moves us to using data from a trusted/maintained/accurate data source.

This change will also allow us to remove a few timing fields from
DocumentState as part of a subsequent change.

BUG=621512
==========

[commit-bot: I haz the power, 2016-10-28 19:44:10]

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

[commit-bot: I haz the power, 2016-10-28 19:44:10]

Dry run: This issue passed the CQ dry run.

[Bryan McQuade, 2016-10-28 19:55:35]

The CQ bit was checked by bmcquade@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-10-28 19:56:20]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-10-28 21:01:20]

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

[commit-bot: I haz the power, 2016-10-28 21:01:21]

Dry run: This issue passed the CQ dry run.

[Pat Meenan, 2016-11-01 15:26:56]

LGTM

[Bryan McQuade, 2016-11-01 15:30:00]

The CQ bit was checked by bmcquade@chromium.org

[commit-bot: I haz the power, 2016-11-01 15:30:22]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-11-01 16:35:37]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-11-01 17:22:18]

Description was changed from

==========
Switch chrome.csi() to use times from WebPerformance.

This is a follow on change to https://codereview.chromium.org/2084583002
which converted chrome.loadTimes() to use WebPerformance-based timings.

The current chrome.csi() implementation uses the unsupported
DocumentState-based metrics. startE, which is derived from
DocumentState.request_time, has sometimes been reporting invalid
values for the last 12 months due to crbug.com/615781. This change
moves us to using data from a trusted/maintained/accurate data source.

This change will also allow us to remove a few timing fields from
DocumentState as part of a subsequent change.

BUG=621512
==========

to

==========
Switch chrome.csi() to use times from WebPerformance.

This is a follow on change to https://codereview.chromium.org/2084583002
which converted chrome.loadTimes() to use WebPerformance-based timings.

The current chrome.csi() implementation uses the unsupported
DocumentState-based metrics. startE, which is derived from
DocumentState.request_time, has sometimes been reporting invalid
values for the last 12 months due to crbug.com/615781. This change
moves us to using data from a trusted/maintained/accurate data source.

This change will also allow us to remove a few timing fields from
DocumentState as part of a subsequent change.

BUG=621512

Committed: https://crrev.com/a2b3e8c87b3f3372fc50ebd8a5e249995d1402ea
Cr-Commit-Position: refs/heads/master@{#429018}
==========

[commit-bot: I haz the power, 2016-11-01 17:22:19]

Patchset 2 (id:??) landed as
https://crrev.com/a2b3e8c87b3f3372fc50ebd8a5e249995d1402ea
Cr-Commit-Position: refs/heads/master@{#429018}