[css-grid] Resolved values of 'grid-template-rows' and 'grid-template-columns'

[mrego]

The resolved value of the 'grid-template-rows' and 'grid-template-columns' properties is the used value, serialized as follows:

• Every track listed, whether implicitly or explicitly created.
• Every track size given as a length in pixels, regardless of sizing function.
• A contiguous run of two or more tracks that have the same size and associated line names may be serialized with the repeat() notation.

More info: http://www.w3.org/TR/css-grid-1/#resolved-track-list

[mrego]

The first case (implicit tracks) is covered by:

• grid-template-columns-rows-resolved-values-001.xht
• grid-inline-template-columns-rows-resolved-values-001.xht

The other cases are already covered by the rest of tests inside grid-definition folder.