commit 8c9196789132507fb3062f7306cb36ef839b7dc4
author Koji Ishii <kojii@chromium.org> Thu Nov 15 07:54:26 2018
committer Commit Bot <commit-bot@chromium.org> Thu Nov 15 07:54:26 2018
tree e42b056f32be2baa93117b2adb3533e5925b03af
parent 8d7b77a1205f89f36b216c301016599c87538354

[LayoutNG] Move should_create_box_fragment to LayoutInline

This patch moves the flag whether to force to create a box
fragment for LayoutInline or not from NGInlineItem to
LayoutInline.

This is part of an effort to reduce re-collecting
NGInlineItem when styles were changed. Re-collecting is
rather an expensive operation that changes in, for instance,
background should not require it.

Note, this patch itself does not reduce the collection,
because we require re-collection whenever NeedsLayout is set.
It is planned in future patches, but this change is needed to
make it happen.

Also benefits to keep the flag turned on once it's on, until
the LayoutInline is reattached.

The change has minor performance gain in most blink_perf.layout
https://pinpoint-dot-chromeperf.appspot.com/job/15f8c74be40000

Bug: 636993
Change-Id: I8d4e7c421d5fad26fee60832cdfbacd575f7ad34
Reviewed-on: https://chromium-review.googlesource.com/c/1333588
Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Reviewed-by: Aleks Totic <atotic@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608292}