Oilpan: move Range object to the oilpan heap.

Source/platform/heap/Heap.h

 /*
  * 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 1006 matching lines @@
 
 template<typename T>
 T* adoptRefCountedGarbageCollected(T* ptr)
 {
     ASSERT(ptr->hasOneRef());
     ptr->deref();
     WTF::adopted(ptr);
     return ptr;
 }
 
+// Classes that contain heap references but aren't themselves heap
+// allocated, have some extra macros available which allows their use
+// to be restricted to cases where the garbage collector is able
+// to discover their heap references.
+//
+// STACK_ALLOCATED(): Use if the object is only stack allocated. Heap objects
+// should be in Members but you do not need the trace method as they are on
+// the stack. (Down the line these might turn in to raw pointers, but for
+// now Members indicates that we have thought about them and explicitly
+// taken care of them.)
+//
+// DISALLOW_ALLOCATION(): Cannot be allocated with new operators but can
+// be a part object. If it has Members you need a trace method and the
+// containing object needs to call that trace method.
+//
+// ALLOW_ONLY_INLINE_ALLOCATION(): Allows only placement new operator.
+// This disallows general allocation of this object but allows to put
+// the object as a value object in collections. If these have Members you
+// need to have a trace method. That trace method will be called
+// automatically by the Heap collections.
+//
 #if COMPILER_SUPPORTS(CXX_DELETED_FUNCTIONS)
 #define DISALLOW_ALLOCATION()                                   \
     private:                                                    \
         void* operator new(size_t) = delete;                    \
         void* operator new(size_t, NotNullTag, void*) = delete; \
         void* operator new(size_t, void*) = delete;
 
 #define ALLOW_ONLY_INLINE_ALLOCATION()                                              \
     public:                                                                         \
         void* operator new(size_t, NotNullTag, void* location) { return location; } \
@@ skipping 720 matching lines @@
 // to export. This forces it to export all the methods from ThreadHeap.
 template<> void ThreadHeap<FinalizedHeapObjectHeader>::addPageToHeap(const GCInfo*);
 template<> void ThreadHeap<HeapObjectHeader>::addPageToHeap(const GCInfo*);
 extern template class PLATFORM_EXPORT ThreadHeap<FinalizedHeapObjectHeader>;
 extern template class PLATFORM_EXPORT ThreadHeap<HeapObjectHeader>;
 #endif
 
 }
 
 #endif // Heap_h