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

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

+// 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 a valid IDL file.
+
+namespace idl_basics {
+  enum EnumType {
+    name1,
+    name2
+  };
+
+  dictionary MyType1 {
+    DOMString a;
+  };
+
+  callback Callback1 = void();
+  callback Callback2 = void(long x);
+  callback Callback3 = void(MyType1 arg);
+  callback Callback4 = void(EnumType type);
+
+  interface Functions {
+    static void function1();
+    static void function2(long x);
+    static void function3(MyType1 arg);
+    static void function4(Callback1 cb);
+    static void function5(Callback2 cb);
+    static void function6(Callback3 cb);
+    static void function7(Callback4 cb);
+  };
+
+  interface Events {
+    static void onFoo1();
+    static void onFoo2(long x);
+    static void onFoo2(MyType1 arg);
+    static void onFoo3(EnumType type);
+  };
+};