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/OnLayoutEvent.java

@@ -0,0 +1,51 @@
+/**
+ * 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 com.facebook.react.bridge.Arguments;
+import com.facebook.react.bridge.WritableMap;
+import com.facebook.react.uimanager.events.Event;
+import com.facebook.react.uimanager.events.RCTEventEmitter;
+
+/**
+ * Event used to notify JS component about changes of its position or dimensions
+ */
+/* package */ class OnLayoutEvent extends Event<OnLayoutEvent> {
+
+  private final int mX, mY, mWidth, mHeight;
+
+  protected OnLayoutEvent(int viewTag, int x, int y, int width, int height) {
+    super(viewTag, 0);
+    mX = x;
+    mY = y;
+    mWidth = width;
+    mHeight = height;
+  }
+
+  @Override
+  public String getEventName() {
+    return "topLayout";
+  }
+
+  @Override
+  public void dispatch(RCTEventEmitter rctEventEmitter) {
+    WritableMap layout = Arguments.createMap();
+    layout.putDouble("x", PixelUtil.toDIPFromPixel(mX));
+    layout.putDouble("y", PixelUtil.toDIPFromPixel(mY));
+    layout.putDouble("width", PixelUtil.toDIPFromPixel(mWidth));
+    layout.putDouble("height", PixelUtil.toDIPFromPixel(mHeight));
+
+    WritableMap event = Arguments.createMap();
+    event.putMap("layout", layout);
+    event.putInt("target", getViewTag());
+
+    rctEventEmitter.receiveEvent(getViewTag(), getEventName(), event);
+  }
+}