Attaching the same use case, but using fixed sized tracks.

Defining a small cell 20x10, the last image is 50px height when it should be 25px height.

Note that if you use "justify|align-items: start;" in this example, the issue is not happening anymore.

Deleted: sample-fixed.html 699 bytes

sample-fixed.html 699 bytes View Download

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f76b5035ab7d677198849bff6cd5c3aa17d78468

commit f76b5035ab7d677198849bff6cd5c3aa17d78468
Author: svillar <svillar@igalia.com>
Date: Mon Mar 21 14:53:09 2016

[css-grid] Fix height computation for items with intrinsic aspect ratios

We were not computing the height properly for items spanning content
or flexible sized tracks having intrinsic aspect ratios because we were
returning always the "natural" size, meaning that on an image of 100x50
we're always returning 50, even if the image had a specified width.

This change allowed us also to remove a bunch of code imported from flexbox
renderer which is actually not really needed in grid.

BUG= 592975 

Review URL: https://codereview.chromium.org/1778853002

Cr-Commit-Position: refs/heads/master@{#382287}

[add] https://crrev.com/f76b5035ab7d677198849bff6cd5c3aa17d78468/third_party/WebKit/LayoutTests/fast/css-grid-layout/grid-automatic-minimum-intrinsic-aspect-ratio.html
[add] https://crrev.com/f76b5035ab7d677198849bff6cd5c3aa17d78468/third_party/WebKit/LayoutTests/fast/css-grid-layout/resources/blue-100x50.png
[modify] https://crrev.com/f76b5035ab7d677198849bff6cd5c3aa17d78468/third_party/WebKit/Source/core/layout/LayoutGrid.cpp
[modify] https://crrev.com/f76b5035ab7d677198849bff6cd5c3aa17d78468/third_party/WebKit/Source/core/layout/LayoutGrid.h

Already fixed