[react-packager][streamline oss] Move open sourced JS source to react-native-github

Libraries/Utilities/RCTRenderingPerf.js

@@ -0,0 +1,56 @@
+/**
+ * Copyright 2004-present Facebook. All Rights Reserved.
+ *
+ * @providesModule RCTRenderingPerf
+ */
+'use strict';
+
+var ReactDefaultPerf = require('ReactDefaultPerf');
+var ReactPerf = require('ReactPerf');
+
+var invariant = require('invariant');
+
+var perfModules = [];
+var enabled = false;
+
+var RCTRenderingPerf = {
+  // Once perf is enabled, it stays enabled
+  toggle: function() {
+    console.log('Render perfomance measurements enabled');
+    enabled = true;
+  },
+
+  start: function() {
+    if (!enabled) {
+      return;
+    }
+
+    ReactDefaultPerf.start();
+    perfModules.forEach((module) => module.start());
+  },
+
+  stop: function() {
+    if (!enabled) {
+      return;
+    }
+
+    ReactDefaultPerf.stop();
+    ReactDefaultPerf.printInclusive();
+    ReactDefaultPerf.printWasted();
+    perfModules.forEach((module) => module.stop());
+  },
+
+  register: function(module) {
+    invariant(
+      typeof module.start === 'function',
+      'Perf module should have start() function'
+    );
+    invariant(
+      typeof module.stop === 'function',
+      'Perf module should have stop() function'
+    );
+    perfModules.push(module);
+  }
+};
+
+module.exports = RCTRenderingPerf;