[Chromecast] Add proxy server support to chromecast

chromecast/net/BUILD.gn

 # Copyright 2015 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("//testing/test.gni")
 
 source_set("net") {
   sources = [
     "connectivity_checker.cc",
     "connectivity_checker.h",
@@ skipping 13 matching lines @@
       "network_change_notifier_factory_cast.h",
     ]
   }
 
   deps = [
     "//base",
     "//chromecast:chromecast_features",
     "//chromecast/base:cast_sys_info",
     "//chromecast/base/metrics",
     "//chromecast/public",
+    "//components/proxy_config",
     "//net",
   ]
 }
 
 source_set("test_support") {
   testonly = true
 
   sources = [
     "fake_stream_socket.cc",
     "fake_stream_socket.h",
@@ skipping 17 matching lines @@
   ]
 
   deps = [
     ":test_support",
     "//base",
     "//base/test:run_all_unittests",
     "//net",
     "//testing/gtest",
   ]
 }