[chromedriver] Implement connecting to devtools and loading a page.

chrome/test/chromedriver/chromedriver.h

 // 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.
 
 #ifndef CHROME_TEST_CHROMEDRIVER_CHROMEDRIVER_H_
 #define CHROME_TEST_CHROMEDRIVER_CHROMEDRIVER_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 
 class CommandExecutor;
 
 // Inits the command executor. Must be called before |ExecuteCommand|.
+// This may be called during DLL load on Windows.
 void Init(scoped_ptr<CommandExecutor> executor);
 
 // Synchronously executes the given command. Thread safe.
 // Command must be a JSON object:
 // {
 //   "name": <string>,
 //   "parameters": <dictionary>,
 //   "sessionId": <string>
 // }
 // Response will always be a JSON object:
 // {
 //   "status": <integer>,
 //   "value": <object>,
 //   "sessionId": <string>
 // }
 // If "status" is non-zero, "value" will be an object with a string "message"
 // property which signifies the error message.
 void ExecuteCommand(const std::string& command, std::string* response);
 
 // Shuts down the command executor. No commands must be currently executing.
 void Shutdown();
 
 #endif  // CHROME_TEST_CHROMEDRIVER_CHROMEDRIVER_H_