GN: Use lib.unstripped rather than lib.stripped. Add a toolchain.gni

mojo/services/network/BUILD.gn

 # Copyright 2014 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("//mojo/public/mojo_application.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 
   java_library_path = "$target_out_dir/java_library.dex.jar"
 
   mojo_android_application("network") {
     output_name = "network_service"
-    input_so = "$root_out_dir/lib.stripped/libnetwork_service$android_product_extension"
+    input_so = "$root_shlib_dir/${shlib_prefix}network_service$shlib_extension"
     input_dex_jar = java_library_path
     deps = [
       ":java_library",
       ":native_library",
     ]
   }
 
   shared_library("native_library") {
     output_name = "network_service"
 
@@ skipping 115 matching lines @@
     "//mojo/application/public/cpp:test_support",
     "//mojo/common:common_base",
     "//mojo/services/network/public/cpp",
     "//mojo/services/network/public/interfaces",
     "//net",
     "//net:test_support",
     "//testing/gtest",
     "//third_party/mojo/src/mojo/public/cpp/bindings:callback",
   ]
 }