[css-flexbox] Fix main size calculation for overflow:auto

[css-flexbox] Fix main size calculation for overflow:auto

We take child.logicalWidth() as the main size, but that's incorrect - we need
the shrink-to-fit width, whereas this code more or less uses the fill-available
width.

R=leviw@chromium.org
BUG=584363
Committed: https://crrev.com/5c171a11db6f7bc54e2acb84a9de6469894f94b9
Cr-Commit-Position: refs/heads/master@{#373592}

[cbiesinger, 2016-02-04 18:35:14]

The CQ bit was checked by cbiesinger@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-02-04 18:35:39]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1670643002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1670643002/1

[szager1, 2016-02-04 18:46:36]

szager@chromium.org changed reviewers:
+ szager@chromium.org

[szager1, 2016-02-04 18:46:36]

lgtm, thanks for continuing to fix this.

[cbiesinger, 2016-02-04 18:48:46]

The CQ bit was unchecked by cbiesinger@chromium.org

[cbiesinger, 2016-02-04 18:48:49]

The CQ bit was checked by cbiesinger@chromium.org

[commit-bot: I haz the power, 2016-02-04 18:49:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1670643002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1670643002/1

[commit-bot: I haz the power, 2016-02-04 19:48:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-02-04 19:49:47]

Description was changed from

==========
[css-flexbox] Fix main size calculation for overflow:auto

We take child.logicalWidth() as the main size, but that's incorrect - we need
the shrink-to-fit width, whereas this code more or less uses the fill-available
width.

R=leviw@chromium.org
BUG=584363
==========

to

==========
[css-flexbox] Fix main size calculation for overflow:auto

We take child.logicalWidth() as the main size, but that's incorrect - we need
the shrink-to-fit width, whereas this code more or less uses the fill-available
width.

R=leviw@chromium.org
BUG=584363

Committed: https://crrev.com/5c171a11db6f7bc54e2acb84a9de6469894f94b9
Cr-Commit-Position: refs/heads/master@{#373592}
==========

[commit-bot: I haz the power, 2016-02-04 19:49:48]

Patchset 1 (id:??) landed as
https://crrev.com/5c171a11db6f7bc54e2acb84a9de6469894f94b9
Cr-Commit-Position: refs/heads/master@{#373592}