Rewrite base::JSONReader to be 35-40% faster, depending on the input string.

net/test/spawner_communicator.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/spawner_communicator.h"
 
 #include "base/json/json_reader.h"
 #include "base/logging.h"
 #include "base/stringprintf.h"
 #include "base/supports_user_data.h"
@@ skipping 303 matching lines @@
   // Send the start command to spawner server to start the Python test server
   // on remote machine.
   std::string server_return_data;
   int result_code;
   SendCommandAndWaitForResult("start", arguments, &result_code,
                               &server_return_data);
   if (OK != result_code || server_return_data.empty())
     return false;
 
   // Check whether the data returned from spawner server is JSON-formatted.
-  base::JSONReader json_reader;
-  scoped_ptr<base::Value> value(json_reader.JsonToValue(server_return_data,
-                                                        true, false));
+  scoped_ptr<base::Value> value(base::JSONReader::Read(server_return_data));
   if (!value.get() || !value->IsType(base::Value::TYPE_DICTIONARY)) {
     LOG(ERROR) << "Invalid server data: " << server_return_data.c_str();
     return false;
   }
 
   // Check whether spawner server returns valid data.
   DictionaryValue* server_data = static_cast<DictionaryValue*>(value.get());
   std::string message;
   if (!server_data->GetString("message", &message) || message != "started") {
     LOG(ERROR) << "Invalid message in server data: ";
@@ skipping 20 matching lines @@
   std::string server_return_data;
   int result_code;
   SendCommandAndWaitForResult("kill", "", &result_code, &server_return_data);
   if (OK != result_code || server_return_data != "killed")
     return false;
   Shutdown();
   return true;
 }
 
 }  // namespace net