Summary:
This diff adds FlipperStateUpdateListener in public headers, as SonarClient.h depends on it and the sample app depends on SonarClient.h.
This diff fixes the compilation error for Sample and SwiftSample
Ideally travis should have caught it. Fix for travis is coming.
Reviewed By: jknoxville
Differential Revision: D9462177
fbshipit-source-id: e3e0ec90f9083294d4a131989ec0eaee02b52791