[css-flexbox] Have to use forceChildLayout to force layout

[css-flexbox] Have to use forceChildLayout to force layout

The flexbox code was assuming that calling layoutIfNeeded()
will do a full layout if needsLayout() is true.

However, that is not the case. It is possible for needsLayout()
to return true because posChildNeedsLayout is true, in which
case calling layout() will not do the full layout that the
flexbox code expects. Instead, call forceChildLayout to
ensure that layout happens.

R=eae@chromium.org,dgrogan@chromium.org
CC=szager@chromium.org
BUG=633212, 629491
Review-Url: https://codereview.chromium.org/2219433002
Cr-Commit-Position: refs/heads/master@{#410135}
(cherry picked from commit e929360ccd93a1e98db3b19929a68d1ed4fa4d5d)

Committed: https://chromium.googlesource.com/chromium/src/+/92a2a1f5852a882ef9671a8d792313dc670ac899

[cbiesinger, 2016-08-08 02:39:03]

Description was changed from

==========
[css-flexbox] Have to use forceChildLayout to force layout

The flexbox code was assuming that calling layoutIfNeeded()
will do a full layout if needsLayout() is true.

However, that is not the case. It is possible for needsLayout()
to return true because posChildNeedsLayout is true, in which
case calling layout() will not do the full layout that the
flexbox code expects. Instead, call forceChildLayout to
ensure that layout happens.

R=eae@chromium.org,dgrogan@chromium.org
CC=szager@chromium.org
BUG=633212,629491

Review-Url: https://codereview.chromium.org/2219433002
Cr-Commit-Position: refs/heads/master@{#410135}
(cherry picked from commit e929360ccd93a1e98db3b19929a68d1ed4fa4d5d)
==========

to

==========
[css-flexbox] Have to use forceChildLayout to force layout

The flexbox code was assuming that calling layoutIfNeeded()
will do a full layout if needsLayout() is true.

However, that is not the case. It is possible for needsLayout()
to return true because posChildNeedsLayout is true, in which
case calling layout() will not do the full layout that the
flexbox code expects. Instead, call forceChildLayout to
ensure that layout happens.

R=eae@chromium.org,dgrogan@chromium.org
CC=szager@chromium.org
BUG=633212,629491

Review-Url: https://codereview.chromium.org/2219433002
Cr-Commit-Position: refs/heads/master@{#410135}
(cherry picked from commit e929360ccd93a1e98db3b19929a68d1ed4fa4d5d)

Committed:
https://chromium.googlesource.com/chromium/src/+/92a2a1f5852a882ef9671a8d7923...
==========

[cbiesinger, 2016-08-08 02:39:05]

Committed patchset #1 (id:1) manually as
92a2a1f5852a882ef9671a8d792313dc670ac899.