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This change adds metrics for the Password Edit dialog. It records what
exectly user updated.

Bug: 377410
Change-Id: I8940bb9960eaf79b569cae2130246ea043e1adda
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2426594
Commit-Queue: Viktor Semeniuk <vsemeniuk@google.com>
Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811679}