Fixed AndroidHorizontalScrollView issue

react-native 0.49.0 introduces a weird breaking change that don't allow
us to use requireNativeComponent twice of the same view name, and since
we are using the same implementation of ScrollView.js, we are requiring
AndroidHorizontalScrollView twice, which now conflicts with the current
ScrollView component and throws a error.

This commit implements ReactHorizontalNestedScrollViewManager that
replaces the native view name (REACT_CLASS) and extends the default behavior
of the ReactHorizontalScrollViewManager.

Author: cesardeazevedo

android/src/main/java/com/rnnestedscrollview/RNNestedScrollViewPackage.java

@@ -19,7 +19,8 @@ public List<NativeModule> createNativeModules(ReactApplicationContext reactConte
     @Override
     public List<ViewManager> createViewManagers(ReactApplicationContext reactContext) {
       return Arrays.<ViewManager>asList(
-          new ReactNestedScrollViewManager()
+          new ReactNestedScrollViewManager(),
+          new ReactHorizontalNestedScrollViewManager()
       );
     }
 }

android/src/main/java/com/rnnestedscrollview/ReactHorizontalNestedScrollViewManager.java

@@ -0,0 +1,22 @@
+package com.rnnestedscrollview;
+
+import com.facebook.react.views.scroll.ReactHorizontalScrollViewManager;
+
+/**
+ * react-native@0.49.0 introduces a weird breaking change that don't allow us to use
+ * requireNativeComponent twice of the same view name, and since we are using the same
+ * implementation of ScrollView.js, we are requiring AndroidHorizontalScrollView twice
+ * which now throws a error.
+ *
+ * This class only exists to replace the native view name (REACT_CLASS) and extends the default
+ * behavior of the ReactHorizontalScrollViewManager.
+ */
+public class ReactHorizontalNestedScrollViewManager extends ReactHorizontalScrollViewManager {
+
+  protected static final String REACT_CLASS = "AndroidHorizontalNestedScrollView";
+
+  @Override
+  public String getName() {
+    return REACT_CLASS;
+  }
+}

lib/NestedScrollView.js

@@ -17,6 +17,7 @@ const {
   View,
   Animated,
   Platform,
+  UIManager,
   StyleSheet,
   PointPropType,
   ViewPropTypes,
@@ -851,7 +852,7 @@ if (Platform.OS === 'android') {
     nativeOnlyProps
   );
   AndroidHorizontalScrollView = requireNativeComponent(
-    'AndroidHorizontalScrollView',
+    'AndroidHorizontalNestedScrollView',
     (ScrollView: ReactClass<any>),
     nativeOnlyProps
   );