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Moving from a tab of a display that has more modes to a tab
of another display that has less modes, where the selected
mode of the first display has index >= max index of the second
display's modes, this would result in the first display's mode
changing to the previous one in the slider.

This CL fixes this issue by ignoring change callbacks when the
various parameters of the currently selected display are still
out of sync.

BUG=822248

Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I97d1a55b87ad99d9d6821270618609a7c4a880a7
Reviewed-on: https://chromium-review.googlesource.com/965630
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543903}