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NotificationPlatformBridge for TRANSIENT notifications until such time
that platform bridges can be updated to handle TRANSIENT notifications
via their delegates.

This should not have any immediate effect as would-be TRANSIENT
notifications do not use NotificationDisplayService yet, but it allows
them to be updated to use NDS while the platform bridges are still a
work in progress.

Bug: 783018
Change-Id: I224da7b03172152fbd9a5ee2cd4d5017a4de5f74
Reviewed-on: https://chromium-review.googlesource.com/779067Reviewed-by: Peter Beverloo <peter@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#518427}