Add API for custom library loading

components/cronet/android/test/cronet_url_request_context_config_test.cc

 // Copyright 2015 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.
 
 #include "cronet_url_request_context_config_test.h"
 
 #include <jni.h>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
@@ skipping 27 matching lines @@
   CHECK_EQ(config->data_reduction_proxy_key, "abcd");
   CHECK_EQ(config->user_agent, "efgh");
   CHECK_EQ(config->experimental_options, "ijkl");
   CHECK_EQ(config->data_reduction_primary_proxy, "mnop");
   CHECK_EQ(config->data_reduction_fallback_proxy, "qrst");
   CHECK_EQ(config->data_reduction_secure_proxy_check_url, "uvwx");
   CHECK_EQ(config->storage_path,
            base::android::ConvertJavaStringToUTF8(env, jstorage_path));
 }
 
+static void LibraryExists(JNIEnv* env, const JavaParamRef<jclass>& jcaller) {
+  return;
+}
+
 bool RegisterCronetUrlRequestContextConfigTest(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
-}  // namespace cronet
+}  // namespace cronet