open in editor button for yellow box

Summary:
Here is the demo https://www.dropbox.com/s/ljh7f9654sqgdqc/demo.mov?dl=0
Closes https://github.com/facebook/react-native/pull/8418

Differential Revision: D3499515

Pulled By: frantic

fbshipit-source-id: 1bd4cd79770f1bf1b82723ad803359df177ca3c5

Libraries/JavaScriptAppEngine/Initialization/openFileInEditor.js

@@ -0,0 +1,23 @@
+/**
+ * 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.
+ *
+ * @providesModule openFileInEditor
+ * @flow
+ */
+'use strict';
+
+const getDevServer = require('getDevServer');
+
+function openFileInEditor(file: string, lineNumber: number) {
+  fetch(getDevServer().url + 'open-stack-frame', {
+    method: 'POST',
+    body: JSON.stringify({file, lineNumber}),
+  });
+}
+
+module.exports = openFileInEditor;