Prase IDL files in common/extensions/api PRESUBMIT check.

chrome/common/extensions/api/test_presubmit/invalid_idl_6.idl

Index: chrome/common/extensions/api/test_presubmit/invalid_idl_6.idl
diff --git a/chrome/common/extensions/api/test_presubmit/invalid_idl_6.idl b/chrome/common/extensions/api/test_presubmit/invalid_idl_6.idl
new file mode 100644
index 0000000000000000000000000000000000000000..2b2ff68dc6e999f440c06ccb9e0c392f86140854
--- /dev/null
+++ b/chrome/common/extensions/api/test_presubmit/invalid_idl_6.idl
@@ -0,0 +1,10 @@
+// Copyright 2013 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.
+
+// Tests an invalid IDL file.
+
+namespace test {
+  // Unexpected ")" after symbol long.
+  callback Callback1 = void(long );
+};