[Android Webview] Refactor LoadUrlTest and work on embedded_test_server custom handler

android_webview/test/embeddedtestserver/aw_test_jni_onload.h

+// Copyright 2017 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.
+
+#ifndef ANDROID_WERBVIEW_TEST_EMBEDDEDTESTSERVER_ANDROID_WEBVIEW_TEST_JNI_ONLOAD_H_
+#define ANDROID_WERBVIEW_TEST_EMBEDDEDTESTSERVER_ANDROID_WEBVIEW_TEST_JNI_ONLOAD_H_
+
+#include <jni.h>
+
+namespace android_webview {
+namespace test {
+
+bool OnJNIOnLoadRegisterJNI(JNIEnv* env);
+bool OnJNIOnLoadInit();
+
+}  // namespace test
+}  // namespace android_webview
+
+#endif  // ANDROID_WERBVIEW_TEST_EMBEDDEDTESTSERVER_ANDROID_WEBVIEW_TEST_JNI_ONLOAD_H_