histogram: Add Platform.Hibernate.LoginToResumeReady

Add a metric that represents the amount of time the user had to wait
after authenticating before resume was ready to be attempted. The
implementation of this metric is at crrev.com/c/3887838 .

BUG=b:232184089
TEST=Hibernate and resume

Change-Id: I11231ecf8f4e9a6201d658a12bdb4c38c3c60cd6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3887938


Commit-Queue: Evan Green <evgreen@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1045335}