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Listen for destination events and update UI when destination changes.

Bug: 773928
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I1c9aff4f5e6fd1d856727064ab76058c30b12125
Reviewed-on: https://chromium-review.googlesource.com/823579
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524473}