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When a fragmented (line broken) link has focus, we use
one of its fragments (not their union) as search origin.

Going Down: Start at the first fragment.
Going Up: Start at the last fragment.

This avoid an endless scroll loop when trying to scroll
a page downwards:

  aaaaa FFFFFF
  FFFFFFFF

When F is focused after a SCROLL, we now search below its
first fragment, instead of going back to #a. This avoids
a SCROLL-F-a-SCROLL-F-a loop.

Bug: 1015965, 1029269

Change-Id: I4703c28d59f16db4f36f2524943ee4ed067b2dd1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1912661
Commit-Queue: Hugo Holgersson <hholgersson@fb.com>
Reviewed-by: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#720410}