Android: Track whether app is in foreground

Source/Android/jni/CMakeLists.txt

@@ -1,4 +1,5 @@
 add_library(main SHARED
+  ActivityTracker.cpp
   Cheats/ARCheat.cpp
   Cheats/Cheats.h
   Cheats/GeckoCheat.cpp
@@ -11,6 +12,7 @@ add_library(main SHARED
   GameList/GameFile.cpp
   GameList/GameFile.h
   GameList/GameFileCache.cpp
+  GpuDriver.cpp
   Host.cpp
   Host.h
   InfinityConfig.cpp
@@ -32,7 +34,6 @@ add_library(main SHARED
   RiivolutionPatches.cpp
   SkylanderConfig.cpp
   WiiUtils.cpp
-  GpuDriver.cpp
 )
 
 target_link_libraries(main