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Convert the imperative implementation to all-declarative polymer
(for the most part). Add closure_compile build configuration and fix the
problems it showed up.
This change should be a no-op in terms of the UI presented.

Bug: 879660

Change-Id: I60d607f1b556a5a2a31f7cb776abb1ff6db38660
Reviewed-on: https://chromium-review.googlesource.com/1210385
Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592160}