ninja windows: Support magic idl build rules

test/win/idl-rules/history_indexer_user.cc

Index: test/win/idl-rules/history_indexer_user.cc
diff --git a/test/win/idl-rules/history_indexer_user.cc b/test/win/idl-rules/history_indexer_user.cc
new file mode 100644
index 0000000000000000000000000000000000000000..74def5ef83f5da38ddfb81f6183c707b7966000a
--- /dev/null
+++ b/test/win/idl-rules/history_indexer_user.cc
@@ -0,0 +1,15 @@
+// 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.
+
+#include "history_indexer.h"
+
+// Use the thing in the IDL.
+int main() {
+  IChromeHistoryIndexer** indexer = 0;
+  IID fake_iid;
+  CoCreateInstance(fake_iid, NULL, CLSCTX_INPROC,
+                   __uuidof(IChromeHistoryIndexer),
+                   reinterpret_cast<void**>(indexer));
+  return 0;
+}