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We were stretching items that had auto cross margins. This patch sets a
flag on FlexItem when it needs relayout due to stretching. It's not
elegant but is also not intrusive.

This reverts commit 2390edbd.

Bug: 845235, 1015475
Change-Id: Iebefb670f2d3ae4047565077776a6d7a1ff2c2fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1867434
Commit-Queue: David Grogan <dgrogan@chromium.org>
Reviewed-by: Christian Biesinger <cbiesinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708455}