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This CL implements a basic dialog-based notification UI for Android
client.

Bug: 1001291
Change-Id: If7df03179ad7a143a6c805c66595dbf7815eb074
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1846048
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703926}