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

android_webview/embeddedtestserver/BUILD.gn

+# 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.
+
+import("//build/config/android/config.gni")
+import("//build/config/android/rules.gni")
+
+android_library("aw_net_java_test_support") {
+  testonly = true
+  java_files = [
+    "java/src/org/chromium/net/test/AwEmbeddedTestServer.java",
+    "../../net/test/android/javatests/src/org/chromium/net/test/EmbeddedTestServer.java",
+    "../../net/test/android/javatests/src/org/chromium/net/test/EmbeddedTestServerImpl.java",
+    "../../net/test/android/javatests/src/org/chromium/net/test/EmbeddedTestServerService.java",
+  ]
+  deps = [
+    "//base:base_java",
+    "//base:base_java_test_support",
+    "//net/android:net_java",
+    "//third_party/android_tools:android_support_annotations_java",
+    "//third_party/android_tools:legacy_http_javalib",
+  ]
+  srcjar_deps = [ "//net/android:embedded_test_server_aidl" ]
+}
+
+android_apk("aw_net_test_support_apk") {
+  testonly = true
+
+  # Used as an additional_apk in test scripts.
+  never_incremental = true
+  deps = [
+    ":aw_net_java_test_support",
+    "//base:base_java",
+  ]
+  android_manifest = "java/AndroidManifest.xml"
+  apk_name = "ChromiumNetTestAwsupport"
+}