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This is reland of crrev.com/c/1295633 with some fix.

When ARC++ app builds bundled notifications, multiple individual
notifications are sent and then replaced with a single bundled
notification. The indicator icon showed such update as-is, resulting
in flashing. This change limits the frequency to reflect notification
count updates for avoiding such effect.

Bug: 892021
Change-Id: If7dbfdfdc530d3498f271f9b7b15b2d02b6b216d
Reviewed-on: https://chromium-review.googlesource.com/c/1298829Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603001}