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The individual bridges can always convert from Profile* to profile id
easily, but the reverse is not true. This is an issue when the profile
manager is shutting down because the reverse lookup depends on the
profile manager still being operational.

Unlike when the bridge is handling interactions with a notification,
the profile must already be loaded when Display(), Close() or
GetDisplayed() is called.

This is blocking fixing some bugs in NotificationPlatformBridgeChromeOs:
https://chromium-review.googlesource.com/c/chromium/src/+/979268

Bug: none
Change-Id: Ibcb2b61cf2f03408a432edfd0a252ec01e9fe30b
Reviewed-on: https://chromium-review.googlesource.com/982648
Commit-Queue: Evan Stade <estade@chromium.org>
Reviewed-by: Finnur Thorarinsson <finnur@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548298}