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This CL adds a profile proto database for chrome cart. Detailed
functions of the database will be added in a later patch.

Bug: 1157892
Change-Id: I30fb26b11463bf66a075f193bf5131baef69a92e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2612276
Commit-Queue: Yue Zhang <yuezhanggg@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843168}