[chromedriver] Add chrome.detach option for configuring Chrome not to quit

chrome/test/webdriver/webdriver_session.h

 // Copyright (c) 2011 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_WEBDRIVER_WEBDRIVER_SESSION_H_
 #define CHROME_TEST_WEBDRIVER_WEBDRIVER_SESSION_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 59 matching lines @@
   ~Session();
 
   // Starts the session thread and a new browser, using the exe found at
   // |browser_exe| and duplicating the provided |user_data_dir|.
   // If |browser_exe| is empty, it will search in all the default locations.
   // It |user_data_dir| is empty, it will use a temporary dir.
   // Returns true on success. On failure, the session will delete
   // itself and return an error code.
   Error* Init(const Automation::BrowserOptions& options);
 
-  // Should be called before executing a command. Performs necessary waits
-  // and frame switching.
+  // Should be called before executing a command.
   Error* BeforeExecuteCommand();
 
+  // Should be called after executing a command.
+  Error* AfterExecuteCommand();
+
   // Terminates this session and deletes itself.
   void Terminate();
 
   // Executes the given |script| in the context of the given frame.
   // The |script| should be in the form of a function body
   // (e.g. "return arguments[0]"), where |args| is the list of arguments to
   // pass to the function. The caller is responsible for the script result
   // |value|, which is set only if there is no error.
   Error* ExecuteScript(const FrameId& frame_id,
                        const std::string& script,
@@ skipping 310 matching lines @@
   Options options_;
 
   DISALLOW_COPY_AND_ASSIGN(Session);
 };
 
 }  // namespace webdriver
 
 DISABLE_RUNNABLE_METHOD_REFCOUNT(webdriver::Session);
 
 #endif  // CHROME_TEST_WEBDRIVER_WEBDRIVER_SESSION_H_