Add Origin Trial layout tests for IDL bindings

third_party/WebKit/Source/core/testing/OriginTrialsTestPartial.idl

 // Copyright 2016 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.
 
 [
     OriginTrialEnabled=OriginTrialsSampleAPI
 ]
 partial interface OriginTrialsTest {
     const unsigned short CONSTANT_PARTIAL = 2;
     readonly attribute boolean normalAttributePartial;
     static readonly attribute boolean staticAttributePartial;
-    boolean methodPartial();
+    boolean normalMethodPartial();
     static boolean staticMethodPartial();
+
+    // These are only available in a secure context.
+    // TODO(crbug.com/695123): Add [SecureContext] extended attribute when fixed
+    //   to work with [OriginTrialEnabled]
+    readonly attribute boolean secureAttributePartial;
+    static readonly attribute boolean secureStaticAttributePartial;
+    boolean secureMethodPartial();
+    static boolean secureStaticMethodPartial();
 };
-