CommandLine: add a CopySwitchesFrom() for copying from another CommandLine

chrome/test/ui_test_utils.cc

Index: chrome/test/ui_test_utils.cc
diff --git a/chrome/test/ui_test_utils.cc b/chrome/test/ui_test_utils.cc
index eb992b6b94fb5c7600785348eec004436c3b88ca..6298b6281ab76b1a9c7692f4a42c46aa7cc3703a 100644
--- a/chrome/test/ui_test_utils.cc
+++ b/chrome/test/ui_test_utils.cc
@@ -615,11 +615,10 @@ TestWebSocketServer::TestWebSocketServer(const FilePath& root_directory) {
   cmd_line->AppendSwitchWithValue("server", "start");
   cmd_line->AppendSwitch("chromium");
   cmd_line->AppendSwitch("register_cygwin");
-  cmd_line->AppendSwitchWithValue("root", root_directory.ToWStringHack());
+  cmd_line->AppendSwitchPath("root", root_directory);
   temp_dir_.CreateUniqueTempDir();
   websocket_pid_file_ = temp_dir_.path().AppendASCII("websocket.pid");
-  cmd_line->AppendSwitchWithValue("pidfile",
-                                  websocket_pid_file_.ToWStringHack());
+  cmd_line->AppendSwitchPath("pidfile", websocket_pid_file_);
   SetPythonPath();
   base::LaunchApp(*cmd_line.get(), true, false, NULL);
 }
@@ -661,8 +660,7 @@ TestWebSocketServer::~TestWebSocketServer() {
   scoped_ptr<CommandLine> cmd_line(CreateWebSocketServerCommandLine());
   cmd_line->AppendSwitchWithValue("server", "stop");
   cmd_line->AppendSwitch("chromium");
-  cmd_line->AppendSwitchWithValue("pidfile",
-                                  websocket_pid_file_.ToWStringHack());
+  cmd_line->AppendSwitchPath("pidfile", websocket_pid_file_);
   base::LaunchApp(*cmd_line.get(), true, false, NULL);
 }