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The Box Alignment specification defines a new value 'normal' to be used
as default for the different layout models, which will define the
specific behavior for each case. This patch adds a new CSS value in the
parsing logic and adapts the Content Alignment properties to the new
value.

The 'auto' value is no longer valid and the Computed Value will be
always the specified value. Hence, I removed the StyleResolver logic
because is not required now; the specific behavior of the 'normal'
value will be resolved at layout time.

Computed value of both align-content and justify-content is the
specified value, we don't have to resolve any 'auto' value now.

Additionally, this patch updates the layout logic as well, for both
Flexbox and Grid layout models.

BUG=565883

Review URL: https://codereview.chromium.org/1583433002

Cr-Commit-Position: refs/heads/master@{#375556}