Fix a crash when opening CronetTest app

components/cronet/android/test/src/org/chromium/cronet_test_apk/MockUrlRequestJobUtil.java

Index: components/cronet/android/test/src/org/chromium/cronet_test_apk/MockUrlRequestJobUtil.java
diff --git a/components/cronet/android/test/src/org/chromium/cronet_test_apk/MockUrlRequestJobUtil.java b/components/cronet/android/test/src/org/chromium/cronet_test_apk/MockUrlRequestJobUtil.java
new file mode 100644
index 0000000000000000000000000000000000000000..fb10546d397ab93ef4ac20624af801f10525c361
--- /dev/null
+++ b/components/cronet/android/test/src/org/chromium/cronet_test_apk/MockUrlRequestJobUtil.java
@@ -0,0 +1,19 @@
+// Copyright 2014 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.cronet_test_apk;
+
+import org.chromium.base.JNINamespace;
+
+@JNINamespace("cronet")
+public final class MockUrlRequestJobUtil {
+    /**
+     * Adds url interceptors for mock urls that are used in testing.
+     */
+    public static void addUrlInterceptors() {
+        nativeAddUrlInterceptors();
+    }
+
+    private static native void nativeAddUrlInterceptors();
+}