Summary: Adds an optional interface that, when implemented, adds a "Report Bug" button to the top of the screen. This is a weird Android-ism that's sadly still the recommended way of providing hooks into Fragments: https://developer.android.com/guide/components/fragments#EventCallbacks In order to keep things vanilla here, let's follow that pattern. Reviewed By: jknoxville Differential Revision: D13045578 fbshipit-source-id: 1506fcfc630c2d1183d7d1eaf470d23954e0c097