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This change adds DisplayAlignmentController, a class that manages a set
of DisplayAlignmentIndicators to be shown when the mouse repeatedly hits the
edges of a display within a short period.

Note: This is a continuation of crrev.com/c/2146794

Bug: 1070122
Change-Id: I8ab7a84754c750f41824b535b2a30105e409f47b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2159620
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780864}