Make class lookup lazy in jni_generator when using lazy method lookup.

base/android/java/src/org/chromium/base/JNIUtils.java

+// 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.base;
+
+/**
+ * This class provides JNI-related methods to the native library.
+ */
+public class JNIUtils {
+    /**
+     * This returns a ClassLoader that is capable of loading Chromium Java code. Such a ClassLoader
+     * is needed for the few cases where the JNI mechanism is unable to automatically determine the
+     * appropriate ClassLoader instance.
+     */
+    @CalledByNative
+    public static Object getClassLoader() {
+        return JNIUtils.class.getClassLoader();
+    }
+}