GitLab

AppActivityRegistry class is responsible for:
* collecting information about app state and usage
* combining app usage information with restrictions from policy
* storing the data between the sessions

This changelist creates the skeleton of the class and will be
followed with remaining functionality implementation.

Bug: 1015658
Change-Id: I306830f756c974371551493379f6edb510f6e5c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1954448Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Aga Wronska <agawronska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722629}