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IdentityManagerFactory::Observer is a parallel interface to//chrome's
SigninManagerFactory::Observer. It will be used to replace usage of
that observer in follow up CLs.

BUG=927341

Change-Id: Id377b5b5e20e00b49811302b0ab26a611af1d3d4
Reviewed-on: https://chromium-review.googlesource.com/c/1448754
Auto-Submit: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#628316}