[css-grid] Fix grid-template-columns|rows computed style with content alignment

[css-grid] Fix grid-template-columns|rows computed style with content alignment

Computed style of grid-template-columns and grid-template-rows properties
was including the distribution offset because of content alignment.
We should subtract that offset, like we do for the case of gaps,
when we're calculating the computed style.

BUG=521407
TEST=fast/css-grid-layout/grid-template-columns-rows-computed-style-gaps-content-alignment.html

Committed: https://crrev.com/3cfbacf562e478c396f22a374d58e4ef35e321ee
Cr-Commit-Position: refs/heads/master@{#388477}

[Manuel Rego, 2016-04-20 11:05:13]

rego@igalia.com changed reviewers:
+ cbiesinger@chromium.org, jfernandez@igalia.com, rune@opera.com,
svillar@igalia.com

[Manuel Rego, 2016-04-20 11:05:14]

Pretty simple patch following a similar solution
to what we already have for grid gaps.

[rune, 2016-04-20 11:36:20]

lgtm

[Manuel Rego, 2016-04-20 11:42:19]

The CQ bit was checked by rego@igalia.com

[commit-bot: I haz the power, 2016-04-20 11:42:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1903183002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1903183002/1

[commit-bot: I haz the power, 2016-04-20 12:45:29]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-22 19:22:48]

Description was changed from

==========
[css-grid] Fix grid-template-columns|rows computed style with content alignment

Computed style of grid-template-columns and grid-template-rows properties
was including the distribution offset because of content alignment.
We should subtract that offset, like we do for the case of gaps,
when we're calculating the computed style.

BUG=521407
TEST=fast/css-grid-layout/grid-template-columns-rows-computed-style-gaps-content-alignment.html
==========

to

==========
[css-grid] Fix grid-template-columns|rows computed style with content alignment

Computed style of grid-template-columns and grid-template-rows properties
was including the distribution offset because of content alignment.
We should subtract that offset, like we do for the case of gaps,
when we're calculating the computed style.

BUG=521407
TEST=fast/css-grid-layout/grid-template-columns-rows-computed-style-gaps-content-alignment.html

Committed: https://crrev.com/3cfbacf562e478c396f22a374d58e4ef35e321ee
Cr-Commit-Position: refs/heads/master@{#388477}
==========

[commit-bot: I haz the power, 2016-04-22 19:22:49]

Patchset 1 (id:??) landed as
https://crrev.com/3cfbacf562e478c396f22a374d58e4ef35e321ee
Cr-Commit-Position: refs/heads/master@{#388477}