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

android_webview/test/embedded_test_server/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/android_webview/test/AwEmbeddedTestServer.java",
+    "java/src/org/chromium/android_webview/test/AwEmbeddedTestServerImpl.java",
+    "java/src/org/chromium/android_webview/test/AwEmbeddedTestServerService.java",
+  ]
+  deps = [
+    "//base:base_java",
+    "//base:base_java_test_support",
+    "//net/android:net_java",
+    "//net/android:net_java_test_support",
+  ]
+}
+
+generate_jni("aw_net_jni_headers") {
+  sources = [
+    "java/src/org/chromium/android_webview/test/AwEmbeddedTestServerImpl.java",
+  ]
+  jni_package = "android_webview/test"
+}
+
+source_set("aw_java_test_native_support") {
+  testonly = true
+  sources = [
+    "../../../net/test/android/net_test_jni_onload.cc",
+    "../../../net/test/android/net_test_jni_onload.h",
+    "../../../net/test/embedded_test_server/android/embedded_test_server_android.cc",
+    "../../../net/test/embedded_test_server/android/embedded_test_server_android.h",
+    "aw_embedded_test_server.cc",
+    "aw_embedded_test_server.h",
+    "aw_test_entry_point.cc",
+    "aw_test_jni_onload.cc",
+    "aw_test_jni_onload.h",
+  ]
+  deps = [
+    "//net:test_support",
+  ]
+  public_deps = [
+    ":aw_net_jni_headers",
+    "//net:net_test_jni_headers",
+  ]
+}
+
+shared_library("aw_net_java_test_native_support") {
+  testonly = true
+  deps = [
+    ":aw_java_test_native_support",
+    "//net:test_support",
+  ]
+}
+
+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"
+  shared_libraries = [ ":aw_net_java_test_native_support" ]
+}