Oilpan: add NeedsAdjustAndMark<T> unit test.

Source/platform/heap/HeapTest.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 3945 matching lines @@
 };
 
 volatile bool GCParkingThreadTester::s_sleeperRunning = false;
 volatile bool GCParkingThreadTester::s_sleeperDone = false;
 
 TEST(HeapTest, GCParkingTimeout)
 {
     GCParkingThreadTester::test();
 }
 
+TEST(HeapTest, NeedsAdjustAndMark)
+{
+    // class Mixin : public GarbageCollectedMixin {};
+    EXPECT_TRUE(NeedsAdjustAndMark<Mixin>::value);
+    EXPECT_TRUE(NeedsAdjustAndMark<const Mixin>::value);
+
+    // class SimpleObject : public GarbageCollected<SimpleObject> {};
+    EXPECT_FALSE(NeedsAdjustAndMark<SimpleObject>::value);
+    EXPECT_FALSE(NeedsAdjustAndMark<const SimpleObject>::value);
+
+    // class UseMixin : public SimpleObject, public Mixin {};
+    EXPECT_FALSE(NeedsAdjustAndMark<UseMixin>::value);
+    EXPECT_FALSE(NeedsAdjustAndMark<const UseMixin>::value);
+}
+
 } // WebCore namespace