add some markers to breakdown ReactInstanceManager.processPackages

Reviewed By: alexeylang

Differential Revision: D4469884

fbshipit-source-id: 891a37aaf2fc472b2614e551c3564075a1a43484

ReactAndroid/src/main/java/com/facebook/react/ReactPackageLogger.java

@@ -0,0 +1,12 @@
+// Copyright 2004-present Facebook. All Rights Reserved.
+
+package com.facebook.react;
+
+/**
+ * Interface for the bridge to call for TTI start and end markers.
+ */
+public interface ReactPackageLogger {
+
+  void startProcessPackage();
+  void endProcessPackage();
+}