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

chrome/test/webdriver/commands/create_session.cc

Index: chrome/test/webdriver/commands/create_session.cc
diff --git a/chrome/test/webdriver/commands/create_session.cc b/chrome/test/webdriver/commands/create_session.cc
index d673ead647d63fe13a4afa0bfe76dc497e91ecbb..b76760b8dfcc7f169380a328e3331dff535c5b36 100644
--- a/chrome/test/webdriver/commands/create_session.cc
+++ b/chrome/test/webdriver/commands/create_session.cc
@@ -197,6 +197,10 @@ void CreateSession::ExecutePost(Response* const response) {
     error = GetBooleanCapability(capabilities, "chrome.loadAsync",
                                  &session_options.load_async);
   }
+  if (!error) {
+    error = GetBooleanCapability(capabilities, "chrome.detach",
+                                 &browser_options.detach_process);
+  }
   if (error) {
     response->SetError(error);
     return;