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

android_webview/embeddedtestserver/java/src/org/chromium/net/test/AwEmbeddedTestServer.java

+// 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.
+
+package org.chromium.net.test;
+
+import android.content.Context;
+
+/** A simple file server for java android webview tests which extends
+ *  from class EmbeddedTestServer. It is able to add custom handlers
+ *  which registers with net::test_server::EmbeddedTestServer native code.
+ *
+ * An example use:
+ *   AwEmbeddedTestServer s = new AwEmbeddedTestServer();
+ *   s.initializeNative();
+ *   s.serveFilesFromDirectory("/path/to/my/directory");
+ *   if (!s.start()) {
+ *       throw new SomeKindOfException("Unable to initialize EmbeddedTestServer.");
+ *   }
+ *
+ *   // serve requests...
+ *   s.getURL("/foo/bar.txt");
+ *
+ *   s.shutdownAndWait();
+ *   s.destroy();
+ *
+ * Note that this runs net::test_server::EmbeddedTestServer in a service in a separate APK.
+ */
+public class AwEmbeddedTestServer extends EmbeddedTestServer {
+    private static long[] sCustomHandlers;
+
+    /** Create and initialize a server with the default and custom handlers.
+     *
+     *  This handles native object initialization, server configuration, and server initialization.
+     *  On returning, the server is ready for use.
+     *
+     *  @param context The context in which the server will run.
+     *  @return The created server.
+     */
+    public static AwEmbeddedTestServer createAndStartServer(Context context)
+            throws InterruptedException {
+        AwEmbeddedTestServer server = new AwEmbeddedTestServer();
+        server.initializeNative(context);
+        AwEmbeddedTestServer.sCustomHandlers = server.getCustomHandlers();
+        server.addDefaultHandlers("");
+        server.registerRequestHandlers(sCustomHandlers);
+        if (!server.start()) {
+            throw new EmbeddedTestServerFailure(
+                    "Failed to start serving using default or custom handlers.");
+        }
+        return server;
+    }
+}