Allow typing label names on Windows by not treating things that start with slashes as arguments rat…

tools/gn/gn_main.cc

Index: tools/gn/gn_main.cc
diff --git a/tools/gn/gn_main.cc b/tools/gn/gn_main.cc
index c0300caff810ffe3b67fd2fd1f3ee1a3dc6adcdd..9c86ab5f01468947a8e958183ed35de5d507e6ec 100644
--- a/tools/gn/gn_main.cc
+++ b/tools/gn/gn_main.cc
@@ -27,6 +27,9 @@ std::vector<std::string> GetArgs(const CommandLine& cmdline) {
 
 int main(int argc, char** argv) {
   base::AtExitManager at_exit;
+#if defined(OS_WIN)
+  CommandLine::set_slash_is_not_a_switch();
+#endif
   CommandLine::Init(argc, argv);
 
   const CommandLine& cmdline = *CommandLine::ForCurrentProcess();