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When r728175 <crrev.com/c/1963597> supported traversing
items, it failed to add the size of child inline boxes.

The size of an inline box is different from the union of its
descendants when it has padding.

Bug: 982194
Change-Id: Id2e35cf4136cc0342f509c676f7a678ffcbece80
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2079775Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746511}