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This CL implements a notification client for mobile clients to fetch
notification from gstatic. Currently it only has logic to match rules
and select a notification. It isn't connected to gstatic or any UI
component yet.

Bug: 1001291
Change-Id: I2d58b53363b1db0b9bb836dfcfb5ec2a36126d19
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1812398
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699582}