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Changes:
1) Add policy providers even when they are not active (to show potential policy conflict)
2) Returns caller the optional policy status (source of a policy, conflict etc),

Bug: 1141124
Change-Id: I90356ac7c0ec376fed8cd57a1c7dbcc76a0c7814
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490275Reviewed-by: Sorin Jianu <sorin@chromium.org>
Commit-Queue: Xiaoling Bao <xiaolingbao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824150}