Change |RebuildFragmentTreeSpine| to check |PhysicalFragmentCount| #29337
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This patch changes |RebuildFragmentTreeSpine| to check
|PhysicalFragmentCount| instead of |CanUseNewLayout|.
This is consistent with the change for the subtree layout in
r890653 crrev.com/c/2934743, and can handle flow threads
correctly, because flow threads are not |LayoutNGMixin| even
when NG block fragmentation is enabled.
Bug: 965639, 829028
Change-Id: I8c9cdb16e37e67b7a0a9b0665e633d8eb200395d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2952733
Reviewed-by: Javier Fernandez <jfernandez@igalia.com>
Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#891728}