Add Blink.PrePaint.UpdateTime as an alias of Blink.PaintInvalidation.UpdateTime

Add Blink.PrePaint.UpdateTime as an alias of Blink.PaintInvalidation.UpdateTime

This enable us to compare performance between spinvalidation and
non-spinvalidation in experiments.

BUG=646176
Review-Url: https://codereview.chromium.org/2646163003
Cr-Commit-Position: refs/heads/master@{#445236}
Committed: https://chromium.googlesource.com/chromium/src/+/9f20da5b93854ebcb557065777e310796583f45a

[Xianzhu, 2017-01-20 19:55:14]

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

[commit-bot: I haz the power, 2017-01-20 19:55:35]

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

[Xianzhu, 2017-01-20 19:56:00]

wangxianzhu@chromium.org changed reviewers:
+ chrishtr@chromium.org, pdr@chromium.org

[commit-bot: I haz the power, 2017-01-20 21:28:32]

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

[commit-bot: I haz the power, 2017-01-20 21:28:36]

Dry run: This issue passed the CQ dry run.

[chrishtr, 2017-01-21 01:14:21]

The CQ bit was checked by chrishtr@chromium.org

[chrishtr, 2017-01-21 01:14:22]

lgtm

[commit-bot: I haz the power, 2017-01-21 01:14:44]

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, 2017-01-21 01:18:27]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1484961261738010,
"parent_rev": "0eab689f803e46d5a6ffb863c542ddb8e91fa95a", "commit_rev":
"9f20da5b93854ebcb557065777e310796583f45a"}

[commit-bot: I haz the power, 2017-01-21 01:19:58]

Description was changed from

==========
Add Blink.PrePaint.UpdateTime as an alias of Blink.PaintInvalidation.UpdateTime

This enable us to compare performance between spinvalidation and
non-spinvalidation in experiments.

BUG=646176
==========

to

==========
Add Blink.PrePaint.UpdateTime as an alias of Blink.PaintInvalidation.UpdateTime

This enable us to compare performance between spinvalidation and
non-spinvalidation in experiments.

BUG=646176

Review-Url: https://codereview.chromium.org/2646163003
Cr-Commit-Position: refs/heads/master@{#445236}
Committed:
https://chromium.googlesource.com/chromium/src/+/9f20da5b93854ebcb557065777e3...
==========

[commit-bot: I haz the power, 2017-01-21 01:20:03]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/chromium/src/+/9f20da5b93854ebcb557065777e3...