[css-grid] Fix alignment with content distribution

[Manuel Rego Casasnovas]

If we use content distribution (with "space-around" and that kind of values) and we align one item with "center" and/or "end".
The item uses the space added by the content distribution, but it shouldn't use it.

For gaps this is working as expected.

This is a port of this Blink patch:
https://codereview.chromium.org/1880393005/

The patch has been developed on top of patch for bug #156597, which adds m_offsetBetweenColumns|Rows properties.

[Manuel Rego Casasnovas]

Created attachment 276468 [details]
Patch

[Manuel Rego Casasnovas]

Created attachment 276624 [details]
Patch

Rebased patch

[Sergio Villar Senin]

Comment on attachment 276624 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=276624&action=review

> Source/WebCore/rendering/RenderGrid.cpp:1914
> +        }

Being just two and taking into account that you have a comment just above I'll just do
endOfRow -= gutters + m_offset

> Source/WebCore/rendering/RenderGrid.cpp:1948
> +        }

Ditto.

[Manuel Rego Casasnovas]

Created attachment 277603 [details]
Patch

[Manuel Rego Casasnovas]

Comment on attachment 277603 [details]
Patch

Thanks for the review.

Applied suggested changes.

[WebKit Commit Bot]

Comment on attachment 277603 [details]
Patch

Clearing flags on attachment: 277603

Committed r200181: <http://trac.webkit.org/changeset/200181>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.