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* Convert the central loop of CalculateAndDoLayout() to two nested loops.  The
  outer loop iterates once per line, the inner once per view.  This allows
  unifying all existing calls to AdvanceOneLine() to a single one in the outer
  loop.
* At this point AdvanceOneLine() can be inlined and simplified.

Bug: 1015717
Change-Id: Iecd4832a7b8eafccd69b50a7951628fded1336f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1874825
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708844}