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This CL adds a PolicyManagerInterface that all future Policy Managers
will support, as well as a DefaultPolicyManager.

Bug: 1068797
Change-Id: Idf70e93a6b084e6a519cb65738f45ed51ecaae29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2140994Reviewed-by: Sorin Jianu <sorin@chromium.org>
Commit-Queue: S. Ganesh <ganesh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759682}