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This CL expands the Profile.AddNewUser histogram with additional enum
entries: one for the sign-in interception and one for (long-existing)
profile creation from the sync confirmation flow.

Bug: 1076880, 1121944
Change-Id: Ibe8a2e00b26dd12d2db4fa46309588e1cda994c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2362852Reviewed-by: Alex Ilin <alexilin@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: David Roger <droger@chromium.org>
Auto-Submit: Jan Krcal <jkrcal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801735}