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This fixes the last DRP browser test. Factors the code to a common
location so it can be used in the DRP throttle.

Bug: 721403
Change-Id: I47330f7e9cad75861787caa843d55147a42fb8a4
Reviewed-on: https://chromium-review.googlesource.com/c/1354653Reviewed-by: rajendrant <rajendrant@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612312}