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This CL changes the way we represent user's identity in the pill: we now
show the user's first name (if available) and resort to email,
otherwise.

This CL also moves from Email specific naming of functions towards more
generic "Identity" (as it is not always Name, either).

Bug: 967317
Change-Id: Ibea8f2953687a32a54f70a8a59dbf147d4114db6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1832220
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Thomas Tangl <tangltom@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Auto-Submit: Jan Krcal <jkrcal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703654}