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This patch fixes computing the initial style of a line for non-first
lines.

Example:
  <p>text <span style="word-break: break-all">abcdef...
and the line wraps within "abcdef...", the initial style of the 2nd
line is different from the line sytle.

When NGLineBreaker initializes line-breaking-related properties, the
style of the current box was not available. This patch adds the
current style to NGInlineBreakToken.

Bug: 636993
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Change-Id: I45191cc6491c431b63a6de9e854fb8197d1b945b
Reviewed-on: https://chromium-review.googlesource.com/846585Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#527007}