Add basic TCP socket mojo implementation

mojo/examples/http_server/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.
 
 shared_library("http_server") {
   output_name = "mojo_http_server"
 
   sources = [
     "http_server.cc",
   ]
 
   deps = [
     "//base",
+    "//mojo/common",
     "//mojo/public/c/system:for_shared_library",
     "//mojo/public/cpp/application:standalone",
     "//mojo/public/cpp/bindings",
     "//mojo/public/cpp/utility",
     "//mojo/services/public/interfaces/network",
   ]
 }