[GridNG] Implement alignment within grid-areas.
This patch implements alignment within a grid-item's grid-area. When creating the GridItemData we read of the containers, and grid-item's style, or determine its alignment axis-edge, and if it should be stretched, saving this information on the GridItemData. When placing the grid-item it will use this to adjust the offset. This doesn't implement baseline alignment which requires a secondary pass to correctly determine the baseline for the column/row. The other TODO relates to the constraint-space API, and how grid will need a slightly new concept in order to do block-axis stretching easily. By default non-replaced grid-items will stretch to the available space. A new bit on the space can indicate that we should stretch to the available space (if possible), this is similar to the shrink-to-fit bit we have today. This adds a self-start/self-end test as after implementing this now new tests passed immediately, and I don't believe we had good test coverage for inflow content with these keywords. Bug: 1045599 Change-Id: I8c9cc51381c3d75519e52b32472b58ec96a6a85a Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2492176 Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org> Reviewed-by:Christian Biesinger <cbiesinger@chromium.org> Reviewed-by:
Kurt Catti-Schmidt <kschmi@microsoft.com> Cr-Commit-Position: refs/heads/master@{#821043}
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