GitLab

Re-land of r485142 due to one crash turned to flaky.

This patch fixes to set InlineBoxWrapper when copying fragments to
LayoutBox.

To create InlineBox'es, NGInlineNode::CopyFragmentDataToLayoutBox()
calls LayoutBlockFlow::ConstructLine(), but it does not set
InlineBoxWrapper.

LayoutBlockFlow::ComputeBlockDirectionPositionsForLine() sets
InlineBoxWrapper but LayoutNG does not call this function. It does
several other things, but SetInlineBoxWrapper() is the only thing needed
for CopyFragmentDataToLayoutBox().

BUG=636993, 739365

Review-Url: https://codereview.chromium.org/2975663002
Cr-Commit-Position: refs/heads/master@{#485160}