Introduce infrastructure for tracing ScriptWrappables.

third_party/WebKit/Source/bindings/core/v8/ScriptWrappable.h

 /*
  * Copyright (C) 2010 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 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef ScriptWrappable_h
 #define ScriptWrappable_h
 
+#include "bindings/core/v8/ScriptWrappableVisitor.h"
 #include "bindings/core/v8/WrapperTypeInfo.h"
 #include "core/CoreExport.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/TypeTraits.h"
 #include <v8.h>
 
 namespace blink {
 
 /**
@@ skipping 98 matching lines @@
         return containsWrapper();
     }
 
     void setReference(const v8::Persistent<v8::Object>& parent, v8::Isolate* isolate)
     {
         isolate->SetReference(parent, m_wrapper);
     }
 
     bool containsWrapper() const { return !m_wrapper.IsEmpty(); }
 
+    void markWrapper(v8::Isolate*) const;
+
+    DECLARE_VIRTUAL_TRACE_WRAPPERS() {};
+
     // With Oilpan we don't need a ScriptWrappable destructor.
     //
     // 'RELEASE_ASSERT_WITH_SECURITY_IMPLICATION(!containsWrapper())' is not needed
     // because Oilpan is not using reference counting at all. If containsWrapper() is true,
     // it means that ScriptWrappable still has a wrapper. In this case, the destructor
     // must not be called since the wrapper has a persistent handle back to this ScriptWrappable object.
     // Assuming that Oilpan's GC is correct (If we cannot assume this, a lot of more things are
     // already broken), we must not hit the RELEASE_ASSERT.
 
 private:
@@ skipping 45 matching lines @@
 // in X's cpp code, and instantiate X, i.e. "template class X;".
 #define DECLARE_WRAPPERTYPEINFO() \
 public: \
     const WrapperTypeInfo* wrapperTypeInfo() const override; \
 private: \
     typedef void end_of_define_wrappertypeinfo_not_reached_t
 
 } // namespace blink
 
 #endif // ScriptWrappable_h