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This is very similar to
https://chromium-review.googlesource.com/c/chromium/src/+/2399082 ,
which dealt with items whose inline axis was the flexbox's main axis.
This patch deals with items whose block axis is the flexbox's main axis.

Old behavior: Use post-layout height of image items, obeying
min/main/max height.

New behavior: use the intrinsic height after applying the aspect ratio
and min/main/max width. Ignore computed min/main/max height.

Fixed: 987000
Change-Id: If64eeca9cc541bec863b1132aea4fd89305f5d9b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2433629
Commit-Queue: David Grogan <dgrogan@chromium.org>
Reviewed-by: Christian Biesinger <cbiesinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811420}