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Enables clients to implement the MemoryUsageObserver interface and
register themselves as an observer in order to receive periodic updates
about the usage of memory on the device.

Example use - crrev.com/c/2424505

Bug: 1128204
Change-Id: I17eaf3b8eb58c287e96d8ff217d3356d3d84c06e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2439475Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Auto-Submit: Bailey Berro <baileyberro@chromium.org>
Commit-Queue: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813040}