First pass at updating JNI bindings

Hook up collisionDebug, isFullyLoaded, onLowMemory in Android
Rename class to styleClass in Java to match iOS
Fixed some formatting
Fixes #1905
Fixes #1946
Fixes #1263

include/mbgl/android/native_map_view.hpp

@@ -17,7 +17,7 @@ namespace android {
 
 class NativeMapView : public mbgl::View, private mbgl::util::noncopyable {
 public:
-    NativeMapView(JNIEnv *env, jobject obj, float pixelRatio);
+    NativeMapView(JNIEnv *env, jobject obj, float pixelRatio, int availableProcessors, size_t totalMemory);
     virtual ~NativeMapView();
 
     float getPixelRatio() const override;
@@ -85,6 +85,9 @@ private:
     int fbHeight = 0;
     const float pixelRatio;
 
+    int availableProcessors = 0;
+    size_t totalMemory = 0;
+
     // Ensure these are initialised last
     mbgl::SQLiteCache fileCache;
     mbgl::DefaultFileSource fileSource;