Upstream Android's PathUtils implementation.

base/android/java/CalledByNative.java

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chromeview.base;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+// This annotation is used by the JNI generator to create the necessary JNI
+// bindings and expose this method to native code.
+@Target(ElementType.METHOD)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface CalledByNative {
+    // If present, tells which inner class the method belongs to.
+    public String value() default "";
+}