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

chrome/browser/automation/automation_provider.cc

Index: chrome/browser/automation/automation_provider.cc
diff --git a/chrome/browser/automation/automation_provider.cc b/chrome/browser/automation/automation_provider.cc
index 1dae958aaa5d51edb814fa3d44a10cbdb7282d21..4c0179886b756dcc65d05ffced0f7b5776f94058 100644
--- a/chrome/browser/automation/automation_provider.cc
+++ b/chrome/browser/automation/automation_provider.cc
@@ -7,6 +7,7 @@
 #include <set>
 
 #include "base/callback.h"
+#include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/file_path.h"
 #include "base/json/json_reader.h"
@@ -105,7 +106,9 @@ using base::Time;
 AutomationProvider::AutomationProvider(Profile* profile)
     : profile_(profile),
       reply_message_(NULL),
-      reinitialize_on_channel_error_(false),
+      reinitialize_on_channel_error_(
+          CommandLine::ForCurrentProcess()->HasSwitch(
+              switches::kAutomationReinitializeOnChannelError)),
       is_connected_(false),
       initial_tab_loads_complete_(false),
       network_library_initialized_(true) {