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The Finch experiment is showing that the experiment group has much more
extensions than the control group. Adding these new histograms may help us
understand more about what's happening.

Bug: 722942
Change-Id: Ia3308e61efeeb533c31638ca0f0ecf500c7e0f9c
Reviewed-on: https://chromium-review.googlesource.com/1091695Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Minh Nguyen <mxnguyen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566924}