ninja windows: Support magic idl build rules

test/win/idl-rules/history_indexer.idl

Index: test/win/idl-rules/history_indexer.idl
diff --git a/test/win/idl-rules/history_indexer.idl b/test/win/idl-rules/history_indexer.idl
new file mode 100644
index 0000000000000000000000000000000000000000..e866ce6d90ca6056699f7bc84217f0d5904ca42d
--- /dev/null
+++ b/test/win/idl-rules/history_indexer.idl
@@ -0,0 +1,17 @@
+// Copyright (c) 2012 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.
+
+import "oaidl.idl";
+import "ocidl.idl";
+
+[
+  object,
+  uuid(9C1100DD-51D4-4827-AE9F-3B8FAC4AED72),
+  oleautomation,
+  nonextensible,
+  pointer_default(unique)
+]
+interface IChromeHistoryIndexer : IUnknown {
+  HRESULT SomeFunction([in] VARIANT begin_time, [in] VARIANT end_time);
+};