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This facilitates mocking for unit tests without having to pull in all
of chromecast/browser.

Bug: None
Test: CQ
Change-Id: Ifeafdfeeffcdbf152a4d694f7cfc280cd5887e37
Reviewed-on: https://chromium-review.googlesource.com/1015960
Commit-Queue: Sean Topping <seantopping@chromium.org>
Reviewed-by: Stephen Lanham <slan@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552849}