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This CL adds a proto to serialize dynamically generated data to schedule
a notification and display later.

Bug: 930968
Change-Id: Iadd7ca8f820097db2dee47d664ddbf0ca4528cbf
Reviewed-on: https://chromium-review.googlesource.com/c/1468341
Commit-Queue: Xing Liu <xingliu@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635812}