Oilpan: Prepare to make ExecutionContext GarbageCollectedMixin.

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 3960 matching lines @@
 
     // 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);
 }
 
+TEST(HeapTest, Bind)
+{
+    Closure closure = bind(&Bar::trace, Bar::create(), static_cast<Visitor*>(0));
+    Heap::collectGarbage(ThreadState::NoHeapPointersOnStack);
+    // The closure should have a persistent handle to the Bar.
+    EXPECT_EQ(1u, Bar::s_live);
+
+    Closure closure2 = bind(&Bar::trace, RawPtr<Bar>(Bar::create()), static_cast<Visitor*>(0));
+    Heap::collectGarbage(ThreadState::NoHeapPointersOnStack);
+    // The closure should have a persistent handle to the Bar.
+    EXPECT_EQ(2u, Bar::s_live);
+
+    UseMixin::s_traceCount = 0;
+    Mixin* mixin = UseMixin::create();
+    Closure mixinClosure = bind(&Mixin::trace, mixin, static_cast<Visitor*>(0));
+    Heap::collectGarbage(ThreadState::NoHeapPointersOnStack);
+    // The closure should have a persistent handle to the mixin.
+    EXPECT_EQ(1, UseMixin::s_traceCount);
+}
+
+
 } // WebCore namespace