[css-grid] Avoid computing available space if gap is not a percentage

[css-grid] Avoid computing available space if gap is not a percentage

This patch modifies LayoutGrid::gridGapForDirection() because
we only need to calculate the available space if the grid gap
is a percentage. Otherwise we can skip this operation.

BUG=615248
Committed: https://crrev.com/b72a2612ebdee71a9114d184d970a5844c6e7c38
Cr-Commit-Position: refs/heads/master@{#417568}

[Manuel Rego, 2016-09-09 08:14:51]

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

[Manuel Rego, 2016-09-09 08:14:52]

This is just a simple patch after:
https://codereview.chromium.org/2323793002/

[svillar, 2016-09-09 10:17:39]

lgtm

[Manuel Rego, 2016-09-09 11:39:28]

The CQ bit was checked by rego@igalia.com

[commit-bot: I haz the power, 2016-09-09 11:39:48]

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, 2016-09-09 13:00:17]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-09 13:03:00]

Description was changed from

==========
[css-grid] Avoid computing available space if gap is not a percentage

This patch modifies LayoutGrid::gridGapForDirection() because
we only need to calculate the available space if the grid gap
is a percentage. Otherwise we can skip this operation.

BUG=615248
==========

to

==========
[css-grid] Avoid computing available space if gap is not a percentage

This patch modifies LayoutGrid::gridGapForDirection() because
we only need to calculate the available space if the grid gap
is a percentage. Otherwise we can skip this operation.

BUG=615248

Committed: https://crrev.com/b72a2612ebdee71a9114d184d970a5844c6e7c38
Cr-Commit-Position: refs/heads/master@{#417568}
==========

[commit-bot: I haz the power, 2016-09-09 13:03:01]

Patchset 1 (id:??) landed as
https://crrev.com/b72a2612ebdee71a9114d184d970a5844c6e7c38
Cr-Commit-Position: refs/heads/master@{#417568}