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

chrome/test/webdriver/webdriver_automation.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_AUTOMATION_H_
 #define CHROME_TEST_WEBDRIVER_WEBDRIVER_AUTOMATION_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 24 matching lines @@
 // Creates and controls the Chrome instance.
 // This class should be created and accessed on a single thread.
 // Note: All member functions are void because they are invoked
 // by posting a task from NewRunnableMethod.
 class Automation {
  public:
   struct BrowserOptions {
     BrowserOptions();
     ~BrowserOptions();
 
+    // The command line to use for launching the browser. If no program is
+    // specified, the default browser executable will be used.
     CommandLine command;
+
+    // The user data directory to be copied and used. If empty, a temporary
+    // directory will be used.
     FilePath user_data_dir;
+
+    // The channel ID of an already running browser to connect to. If empty,
+    // the browser will be launched with an anonymous channel.
     std::string channel_id;
+
+    // True if the Chrome process should only be terminated if quit is called.
+    // If false, Chrome will also be terminated if this process is killed or
+    // shutdown.
+    bool detach_process;
   };
 
   Automation();
   virtual ~Automation();
 
   // Start the system's default Chrome binary.
   void Init(const BrowserOptions& options, Error** error);
 
   // Terminates this session and disconnects its automation proxy. After
   // invoking this method, the Automation can safely be deleted.
@@ skipping 108 matching lines @@
   scoped_ptr<ProxyLauncher> launcher_;
 
   DISALLOW_COPY_AND_ASSIGN(Automation);
 };
 
 }  // namespace webdriver
 
 DISABLE_RUNNABLE_METHOD_REFCOUNT(webdriver::Automation);
 
 #endif  // CHROME_TEST_WEBDRIVER_WEBDRIVER_AUTOMATION_H_