Setting "SubSystem" option on "Link" page for Visual Studio project.

tools/gn/visual_studio_utils_unittest.cc

 // Copyright 2016 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.
 
 #include "tools/gn/visual_studio_utils.h"
 
 #include "base/location.h"
 #include "base/strings/string_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 74 matching lines @@
   ParseCompilerOption("/wd1234", &options);
   ParseCompilerOption("/wd56", &options);
   ASSERT_EQ("1234;56;", options.disable_specific_warnings);
 
   CHECK(options.additional_options.empty());
   ParseCompilerOption("/MP", &options);
   ParseCompilerOption("/bigobj", &options);
   ParseCompilerOption("/Zc:sizedDealloc", &options);
   ASSERT_EQ("/MP /bigobj /Zc:sizedDealloc ", options.additional_options);
 }
+
+TEST(VisualStudioUtils, ParseLinkerOption) {
+  LinkerOptions options;
+  ParseLinkerOption("/SUBSYSTEM:CONSOLE,5.02h", &options);
+  ASSERT_EQ("CONSOLE", options.subsystem);
+
+  ParseLinkerOption("/SUBSYSTEM:WINDOWS", &options);
+  ASSERT_EQ("WINDOWS", options.subsystem);
+}