I have the changes I need slimmed down to the Android JNI_OnLoad event callback and Android Input callback.
https://github.com/EpicGames/UnrealEngine/pull/2313/files
https://github.com/EpicGames/UnrealEngine/pull/2314/files
This is all so I can roll my Cortex/OUYA fork into a UE4 plugin. Developers don’t want to have to build the engine from source. Also as a plugin, it can be activated with the menu toggle.