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This CL adds an observer to update ProfileDataCache when user's profile
photo(include monogram) from IdentityManager is updated.

Bug: 1127886
Change-Id: I0c70f72708e50dceb63eb122055315f7818cba06
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2430984Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Commit-Queue: Alice Wang <aliceywang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811237}