Release React Native for Android

This is an early release and there are several things that are known
not to work if you're porting your iOS app to Android.

See the Known Issues guide on the website.

We will work with the community to reach platform parity with iOS.

ReactAndroid/src/main/java/com/facebook/react/uimanager/ViewAtIndex.java

@@ -0,0 +1,33 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+package com.facebook.react.uimanager;
+
+import java.util.Comparator;
+
+/**
+ * Data structure that couples view tag to it's index in parent view. Used for managing children
+ * operation.
+ */
+/* package */ class ViewAtIndex {
+  public static Comparator<ViewAtIndex> COMPARATOR = new Comparator<ViewAtIndex>() {
+    @Override
+    public int compare(ViewAtIndex lhs, ViewAtIndex rhs) {
+      return lhs.mIndex - rhs.mIndex;
+    }
+  };
+
+  public final int mTag;
+  public final int mIndex;
+
+  public ViewAtIndex(int tag, int index) {
+    mTag = tag;
+    mIndex = index;
+  }
+}