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This CL adds a new UMA metric WebApk.Navigation.InScope which is
recorded on every WebAPK navigation. It records whether WebAPK
navigations are within the WebAPK's scope.

BUG=999648

Change-Id: I0d8fc678f396e8fd55c48aabd41b8878ee8fdcd6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1788304
Commit-Queue: Peter Kotwicz <pkotwicz@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695828}