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cros: Add unit tests for autocomplete gesture and mouse events.

1. Functionality was landed in separate CLs.
2. Refactoring existing unit tests to make it simpler to land
additional unit tests in the future.

Bug: 882050
Change-Id: I86fa9ebb457f9f17342ce88bc1c3fc7edd274e07
Reviewed-on: https://chromium-review.googlesource.com/1213518
Commit-Queue: Daniel Zhang <oxyflush@google.com>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590397}