GitLab

Includes a component-accessible interface for interacting with the
navigation observer manager.

Bug: 817377
Change-Id: I6074e9cfa53cbc7332c1f78b310124be99932abc
Reviewed-on: https://chromium-review.googlesource.com/1030776Reviewed-by: Jialiu Lin <jialiul@chromium.org>
Reviewed-by: Changwan Ryu <changwan@chromium.org>
Commit-Queue: Luke Z <lpz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556776}