[css-grid] Prettify the nested-grid.html perf test

[css-grid] Prettify the nested-grid.html perf test

Grid items have now a fixed height so that the grid could be seen when
opening the test with a browser.

This artificially improves the runs/s of the test because a fixed height is
much cheaper to compute than an auto height, but we do not plan to change it
so the test will still be sensitive to layout regressions.

Committed: https://crrev.com/556444f7441e1693d8cd4b0e23896f228cc238f6
Cr-Commit-Position: refs/heads/master@{#419154}

[svillar, 2016-09-16 12:20:34]

svillar@igalia.com changed reviewers:
+ jfernandez@igalia.com

[jfernandez, 2016-09-16 12:21:44]

lgtm

[svillar, 2016-09-16 12:22:09]

The CQ bit was checked by svillar@igalia.com

[commit-bot: I haz the power, 2016-09-16 12:22:17]

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, 2016-09-16 13:28:17]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-16 13:29:52]

Description was changed from

==========
[css-grid] Prettify the nested-grid.html perf test

Grid items have now a fixed height so that the grid could be seen when
opening the test with a browser.

This artificially improves the runs/s of the test because a fixed height is
much cheaper to compute than an auto height, but we do not plan to change it
so the test will still be sensitive to layout regressions.
==========

to

==========
[css-grid] Prettify the nested-grid.html perf test

Grid items have now a fixed height so that the grid could be seen when
opening the test with a browser.

This artificially improves the runs/s of the test because a fixed height is
much cheaper to compute than an auto height, but we do not plan to change it
so the test will still be sensitive to layout regressions.

Committed: https://crrev.com/556444f7441e1693d8cd4b0e23896f228cc238f6
Cr-Commit-Position: refs/heads/master@{#419154}
==========

[commit-bot: I haz the power, 2016-09-16 13:29:53]

Patchset 1 (id:??) landed as
https://crrev.com/556444f7441e1693d8cd4b0e23896f228cc238f6
Cr-Commit-Position: refs/heads/master@{#419154}