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Notification reporter intends to treat notification as user activity for
screen dim and idle timeouts. Thus it notifies powerd whenever a new
notification (priority > DEFAULT) is drawn or the one that is already
shown is updated.

When a notification of system priority is drawn, chrome keeps updating
the notification until is cleared by user which results in
regular HandleWakeNotification calls to powerd. Thus this can result in
screen staying on forever. Let us not do this.

In the follow up CL, I intend to notify powerd directly where the
notification is created. This way we do not use notification priority
that is already overloaded to determine if the screen should stay on.

BUG=chromium:964470
TEST=Connect external monitor and make sure screen turns off.

Change-Id: I616926994f66982ecb5886f17af85813ee34efe4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1618047
Commit-Queue: Ravi Chandra Sadineni <ravisadineni@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Auto-Submit: Ravi Chandra Sadineni <ravisadineni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661116}