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With this change, the controller tells the script tracker to run checks
when necessary, calls the UI controller to choose a script to run and
run the script that was chosen. The implementation of the UI controller
for choosing the script is not included into this change.

Integration is preliminary, just to get something to get started until
we have a usable UI to try it out. The UI part, implementing script
selection, is missing from this change.

Change-Id: I867bec0e554dfdd87fc2f95e7c9088391621c5c9
Bug: 806868
Reviewed-on: https://chromium-review.googlesource.com/1194034
Commit-Queue: Stephane Zermatten <szermatt@chromium.org>
Reviewed-by: Ganggui Tang <gogerald@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589135}