[css-flexbox] Don't force layout for overflow: auto anymore

[css-flexbox] Don't force layout for overflow: auto anymore

Now that we include the scrollbar in the preferred width due to these changes:
https://chromium.googlesource.com/chromium/src/+/c9b3e99e2a71f7bcc4d9652916347782ff616e0d
https://chromium.googlesource.com/chromium/src/+/906252430fe0108cf163f1fd9c2e96aa283f9cb5%5E%21/

we no longer need to force layout to include the scrollbar in the flex item
size as the above code makes this work correctly. This should help a bit with
performance, too.

(The listed bug is somewhat optimistic; it may help but I haven't really
investigated yet)

R=eae@chromium.org,dgrogan@chromium.org
TEST=n/a, no behavior change
BUG=649988
Committed: https://crrev.com/c03addfdbc3e63d0df45e83f14b6c8d12572ef4b
Cr-Commit-Position: refs/heads/master@{#424632}

[cbiesinger, 2016-10-11 21:10:54]

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

[commit-bot: I haz the power, 2016-10-11 21:11:09]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[eae, 2016-10-11 21:13:31]

Very nice, LGTM

[cbiesinger, 2016-10-11 21:14:53]

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

[commit-bot: I haz the power, 2016-10-11 21:15:09]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[cbiesinger1, 2016-10-11 22:52:09]

The CQ bit was unchecked by cbiesinger@google.com

[cbiesinger1, 2016-10-11 22:52:22]

The CQ bit was checked by cbiesinger@google.com

[cbiesinger1, 2016-10-11 22:52:22]

The patchset sent to the CQ was uploaded after l-g-t-m from eae@chromium.org
Link to the patchset: https://codereview.chromium.org/2411943002/#ps20001
(title: "further simplify & add comment")

[commit-bot: I haz the power, 2016-10-11 22:53:07]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[szager1, 2016-10-11 23:35:03]

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

[szager1, 2016-10-11 23:35:04]

drive-by lgtm

[commit-bot: I haz the power, 2016-10-12 01:21:48]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-10-12 01:23:15]

Description was changed from

==========
[css-flexbox] Don't force layout for overflow: auto anymore

Now that we include the scrollbar in the preferred width due to these changes:
https://chromium.googlesource.com/chromium/src/+/c9b3e99e2a71f7bcc4d965291634...
https://chromium.googlesource.com/chromium/src/+/906252430fe0108cf163f1fd9c2e...

we no longer need to force layout to include the scrollbar in the flex item
size as the above code makes this work correctly. This should help a bit with
performance, too.

(The listed bug is somewhat optimistic; it may help but I haven't really
investigated yet)

R=eae@chromium.org,dgrogan@chromium.org
TEST=n/a, no behavior change
BUG=649988
==========

to

==========
[css-flexbox] Don't force layout for overflow: auto anymore

Now that we include the scrollbar in the preferred width due to these changes:
https://chromium.googlesource.com/chromium/src/+/c9b3e99e2a71f7bcc4d965291634...
https://chromium.googlesource.com/chromium/src/+/906252430fe0108cf163f1fd9c2e...

we no longer need to force layout to include the scrollbar in the flex item
size as the above code makes this work correctly. This should help a bit with
performance, too.

(The listed bug is somewhat optimistic; it may help but I haven't really
investigated yet)

R=eae@chromium.org,dgrogan@chromium.org
TEST=n/a, no behavior change
BUG=649988

Committed: https://crrev.com/c03addfdbc3e63d0df45e83f14b6c8d12572ef4b
Cr-Commit-Position: refs/heads/master@{#424632}
==========

[commit-bot: I haz the power, 2016-10-12 01:23:17]

Patchset 2 (id:??) landed as
https://crrev.com/c03addfdbc3e63d0df45e83f14b6c8d12572ef4b
Cr-Commit-Position: refs/heads/master@{#424632}