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

chrome/test/webdriver/commands/webdriver_command.h

Index: chrome/test/webdriver/commands/webdriver_command.h
diff --git a/chrome/test/webdriver/commands/webdriver_command.h b/chrome/test/webdriver/commands/webdriver_command.h
index 248aa58049104d922218914aea5d7d4c59e386ce..765b59b8e116e30ead02058b373ff04add29fe0d 100644
--- a/chrome/test/webdriver/commands/webdriver_command.h
+++ b/chrome/test/webdriver/commands/webdriver_command.h
@@ -16,6 +16,7 @@ class DictionaryValue;
 
 namespace webdriver {
 
+class Error;
 class Response;
 class Session;
 
@@ -34,6 +35,8 @@ class WebDriverCommand : public Command {
   // Initializes this webdriver command by fetching the command session.
   virtual bool Init(Response* const response);
 
+  virtual void Finish();
+
  protected:
   Session* session_;