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This CL creates the Media History database and the accopmanying tables
that will be used to store information relating to media engagement.

Design doc: https://docs.google.com/document/d/1RAq_RY-R87Dlrkbjnq5ghs7Joax2JIKBHuFBHMlqFdc

Bug: 997813
Change-Id: I3848d172a8cda7b42ead4aa6f409435d6fc83412
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1857044
Commit-Queue: Evan Liu <evliu@google.com>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707549}