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In TableModelObserver, support a OnItemsMoved() operation which indicates
that a number of rows have been reordered in the model. In a subsequent CL,
the TaskManagerTableModel will emit these, with the goal being to
keep a tab properly selected during cross-process navigation.

In TableView and its unittest, handle the OnItemsMoved() operation, by
updating the ListSelectionModel as appropriate.

In ListSelectionModel, Add a |length| parameter to Move, and provide
an efficient implementation of this. Implement IncrementFrom() and
DecrementFrom() in terms of the Move() operation. Add unittests that
exercise Move().

Bug: 527455
Change-Id: I448bc18b2a3efbe6b2acb78d73ee350212bbf485
Reviewed-on: https://chromium-review.googlesource.com/661757
Commit-Queue: Nick Carter <nick@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#502933}