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Make test and existing code changes as needed to incorporate native
layer into the new UI. No behavior changes.

Bug: 773928
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I660a4707a2a54d75e5ca7dde2b9ec10496c5055b
Reviewed-on: https://chromium-review.googlesource.com/807585Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521874}