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

chrome/test/chromedriver/chromedriver.py

 # 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.
 
 import ctypes
 import json
 
 class ChromeDriverException(Exception):
   pass
 class UnknownCommand(ChromeDriverException):
@@ skipping 50 matching lines @@
     response_json = ctypes.string_at(response_data, response_size.value)
     self._lib.Free(response_data)
     response = json.loads(response_json)
     if response['status'] != 0:
       raise _ExceptionForResponse(response)
     return response['value']
 
   def _ExecuteSessionCommand(self, name, params={}):
     return self._ExecuteCommand(name, params, self._session_id)
 
+  def Load(self, url):
+    self._ExecuteSessionCommand('get', {'url': url})
+
   def Quit(self):
     """Quits the browser and ends the session."""
     self._ExecuteSessionCommand('quit')