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This change completes a TODO for auto-sizing the grid container for
the block direction. This is implemented by using the resolved
row/column definitions to determine the total intrinsic grid
block size.

'auto' inline sizes for the grid block will be addressed separately,
as that will be calculated in ComputeMinMaxSizes and will require
some refactoring to maintain const-ness.

After this change, the grid-gutters (gap) WPT tests mostly pass.
The only remaining failures have to do with % and calc sized gutters,
which these changes will also be a prerequisite for. A number of other
TestExpectations failures were able to be removed as well.

Bug: 1045599
Change-Id: I6136c8daa6501facac67281ac5cb493bb07a34d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2488665Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821571}