Update from chromium https://crrev.com/302282

net/test/embedded_test_server/embedded_test_server.cc

 // Copyright (c) 2012 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.
 
 #include "net/test/embedded_test_server/embedded_test_server.h"
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 241 matching lines @@
   delete connection;
 }
 
 GURL EmbeddedTestServer::GetURL(const std::string& relative_url) const {
   DCHECK(Started()) << "You must start the server first.";
   DCHECK(StartsWithASCII(relative_url, "/", true /* case_sensitive */))
       << relative_url;
   return base_url_.Resolve(relative_url);
 }
 
+GURL EmbeddedTestServer::GetURL(
+    const std::string& hostname,
+    const std::string& relative_url) const {
+  GURL local_url = GetURL(relative_url);
+  GURL::Replacements replace_host;
+  replace_host.SetHostStr(hostname);
+  return local_url.ReplaceComponents(replace_host);
+}
+
 void EmbeddedTestServer::ServeFilesFromDirectory(
     const base::FilePath& directory) {
   RegisterRequestHandler(base::Bind(&HandleFileRequest, directory));
 }
 
 void EmbeddedTestServer::RegisterRequestHandler(
     const HandleRequestCallback& callback) {
   request_handlers_.push_back(callback);
 }
 
@@ skipping 66 matching lines @@
           FROM_HERE, closure, run_loop.QuitClosure())) {
     return false;
   }
   run_loop.Run();
 
   return true;
 }
 
 }  // namespace test_server
 }  // namespace net