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i.e., allows counting of home button uses that lead to places
besides, say, the new tab page.

Right now all home button uses are logged as a user action "Home"
and it's a pain to try to figure out based on other UMA histograms
whether the home button leads to the new tab page or some web page.
This makes it easier.

Bug: 953445
Change-Id: I2ad455af3b6bd8884813186a1f54ebaa244b2c73
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1609973Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Reviewed-by: Pedro Amaral <amaralp@chromium.org>
Commit-Queue: Mark Pearson <mpearson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660058}