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We want to know when during the installation process users are canceling

This CL adds a new bucket to the histogram for each cancelable state
of the installation process. Currently, it maps from install state to
reporting bucket by doing arithmetic on enum values. I'm not sure this
is the best way to do this, since it's vulnerable to us changing the
numbering of install states in the future. The alternative would be to
add a static map to the class from State to SetupResult.

Bug: 703927
Change-Id: I7ac2fd19b3370f2c46a7cd4bfe9be78b63f31612
Reviewed-on: https://chromium-review.googlesource.com/c/1331094Reviewed-by: Nicholas Verne <nverne@chromium.org>
Commit-Queue: Fergus Dall <sidereal@google.com>
Cr-Commit-Position: refs/heads/master@{#607465}