Add support for MIDL include directories

test/win/idl-includedirs/idl-includedirs.gyp

Index: test/win/idl-includedirs/idl-includedirs.gyp
diff --git a/test/win/idl-includedirs/idl-includedirs.gyp b/test/win/idl-includedirs/idl-includedirs.gyp
new file mode 100644
index 0000000000000000000000000000000000000000..fcec063a98a7c3a00df8eb53f40b142b310a4b83
--- /dev/null
+++ b/test/win/idl-includedirs/idl-includedirs.gyp
@@ -0,0 +1,26 @@
+# Copyright (c) 2014 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.
+
+{
+  'targets': [
+    {
+      'target_name': 'test_midl_include_dirs',
+      'type': 'executable',
+      'sources': [
+        'hello.cc',
+        'subdir/foo.idl',
+        'subdir/bar.idl',
+      ],
+      'midl_include_dirs': [
+        'subdir',
+      ],
+      'msvs_settings': {
+        'VCMIDLTool': {
+          'OutputDirectory': '<(INTERMEDIATE_DIR)',
+          'DLLDataFileName': '$(InputName)_dlldata.h',
+         },
+      },
+    },
+  ],
+}