Oilpan: Prepare moving DateTimeChooser to Oilpan

Source/platform/heap/Handle.h

 /*
  * Copyright (C) 2014 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 850 matching lines @@
 
 #else // !ENABLE(OILPAN)
 
 template<typename T>
 class DummyBase {
 public:
     DummyBase() { }
     ~DummyBase() { }
 };
 
+// Export this instance to support WillBeGarbageCollectedMixin
+// uses by code residing in non-webcore components.
+template class PLATFORM_EXPORT DummyBase<void>;
+
 #define PassRefPtrWillBeRawPtr WTF::PassRefPtr
 #define RefCountedWillBeGarbageCollected WTF::RefCounted
 #define RefCountedWillBeGarbageCollectedFinalized WTF::RefCounted
 #define RefCountedWillBeRefCountedGarbageCollected WTF::RefCounted
 #define RefCountedGarbageCollectedWillBeGarbageCollectedFinalized WebCore::RefCountedGarbageCollected
 #define ThreadSafeRefCountedWillBeGarbageCollected WTF::ThreadSafeRefCounted
 #define ThreadSafeRefCountedWillBeGarbageCollectedFinalized WTF::ThreadSafeRefCounted
 #define ThreadSafeRefCountedWillBeThreadSafeRefCountedGarbageCollected WTF::ThreadSafeRefCounted
 #define PersistentWillBeMember WebCore::Persistent
 #define RefPtrWillBePersistent WTF::RefPtr
@@ skipping 295 matching lines @@
 struct ParamStorageTraits<T*> : public PointerParamStorageTraits<T*, WebCore::IsGarbageCollectedType<T>::value> {
 };
 
 template<typename T>
 struct ParamStorageTraits<RawPtr<T> > : public PointerParamStorageTraits<T*, WebCore::IsGarbageCollectedType<T>::value> {
 };
 
 } // namespace WTF
 
 #endif