Add support for IsGarbageCollectedType<void>

third_party/WebKit/Source/platform/heap/GarbageCollected.h

 // Copyright 2015 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.
 
 #ifndef GarbageCollected_h
 #define GarbageCollected_h
 
 #include "platform/heap/ThreadState.h"
 #include "wtf/Allocator.h"
 #include "wtf/Assertions.h"
@@ skipping 81 matching lines @@
         || HeapHashMapSubclass::value
         || HeapVectorSubclass::value
         || HeapDequeSubclass::value
         || HeapHashCountedSetSubclass::value
         || HeapTerminatedArraySubclass::value
         || HeapVectorBackingSubclass::value
         || HeapHashTableBackingSubclass::value
         || isHeapAllocatedListHashSetNode;
 };
 
+template <>
+struct IsGarbageCollectedType<void> {
+    static const bool value = false;
+};
+
 // The GarbageCollectedMixin interface and helper macro
 // USING_GARBAGE_COLLECTED_MIXIN can be used to automatically define
 // TraceTrait/ObjectAliveTrait on non-leftmost deriving classes
 // which need to be garbage collected.
 //
 // Consider the following case:
 // class B {};
 // class A : public GarbageCollected, public B {};
 //
 // We can't correctly handle "Member<B> p = &a" as we can't compute addr of
@@ skipping 194 matching lines @@
     static const bool value = sizeof(TrueType) == sizeof(isSizeofKnown(&t));
 };
 
 } // namespace blink
 
 namespace WTF {
 
 } // namespace WTF
 
 #endif