ninja windows: support and test for AdditionalIncludeDirectories

test/win/compiler-flags/additional-include-dirs.gyp

Index: test/win/compiler-flags/additional-include-dirs.gyp
diff --git a/test/win/compiler-flags/additional-include-dirs.gyp b/test/win/compiler-flags/additional-include-dirs.gyp
new file mode 100644
index 0000000000000000000000000000000000000000..42c7e849f63b4c07d226dad35a8e351e252d67f9
--- /dev/null
+++ b/test/win/compiler-flags/additional-include-dirs.gyp
@@ -0,0 +1,20 @@
+# Copyright (c) 2012 Google Inc. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+{
+ 'targets': [
+    {
+      'target_name': 'test_incs',
+      'type': 'executable',
+      'msvs_settings': {
+        'VCCLCompilerTool': {
+          'AdditionalIncludeDirectories': [
+            'subdir',
+          ],
+        }
+      },
+      'sources': ['additional-include-dirs.cc'],
+    },
+  ]
+}