Introduce infrastructure for tracing ScriptWrappables.

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

Index: third_party/WebKit/Source/bindings/core/v8/ScriptWrappable.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/ScriptWrappable.h b/third_party/WebKit/Source/bindings/core/v8/ScriptWrappable.h
index a6150c7bba563e01834d4a6b2e3ea9302a807b9f..b13241ad1087796971ee5fa15088ecb546959e89 100644
--- a/third_party/WebKit/Source/bindings/core/v8/ScriptWrappable.h
+++ b/third_party/WebKit/Source/bindings/core/v8/ScriptWrappable.h
@@ -31,6 +31,7 @@
 #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"
@@ -149,6 +150,14 @@ public:
 
     bool containsWrapper() const { return !m_wrapper.IsEmpty(); }
 
+    static void markWrapperAlive(const v8::Persistent<v8::Object>& handle, v8::Isolate*);
+    void markWrapperAlive(v8::Isolate* isolate) const

[haraken, 2016/04/13 12:26:22]

markWrapperAlive => markWrappers?

[Marcel Hlopko, 2016/04/14 16:39:08]

Done.

+    {
+        markWrapperAlive(m_wrapper, isolate);
+    }
+
+    DECLARE_VIRTUAL_TRACE_WRAPPERS() {};
+
     // With Oilpan we don't need a ScriptWrappable destructor.
     //
     // 'RELEASE_ASSERT_WITH_SECURITY_IMPLICATION(!containsWrapper())' is not needed