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This class includes metadata associated with a notification which
appears on the user's phone and has been synced to the Chrome OS device.

Bug: 1106937
Change-Id: I2591ca19b8752346390c649d85f2c31978f1f37d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2378881Reviewed-by: Regan Hsu <hsuregan@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802069}