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Adds user metric actions for default browser and first party
URL opens. This will be used observe user action sequences.

Bug: 1107489
Change-Id: I7ba0290912a5568219c13b8c4c246d86d4ebf3c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2399084Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806063}