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1) Update the UI to be the same with the web-ui implementation.

2) Add a button to lock_debug_view.cc|h for easy debugging.

Bug: 836336
Change-Id: I89143c7db149dea31bc6848de18e6ecc6386f98b
Reviewed-on: https://chromium-review.googlesource.com/1044746Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Wenzhao (Colin) Zang <wzang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556174}