[v8 gc] Introduce a base class for all objects that can have pending activity

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

Index: third_party/WebKit/Source/bindings/core/v8/WrapperTypeInfo.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/WrapperTypeInfo.h b/third_party/WebKit/Source/bindings/core/v8/WrapperTypeInfo.h
index 490eeac0b0b8c2150beadedeb6d9af5981162f64..5e6ab41b2bf9d81d49eb4e4d6f40dc1fc0e4bc52 100644
--- a/third_party/WebKit/Source/bindings/core/v8/WrapperTypeInfo.h
+++ b/third_party/WebKit/Source/bindings/core/v8/WrapperTypeInfo.h
@@ -39,6 +39,7 @@
 
 namespace blink {
 
+class ActiveScriptWrappable;
 class EventTarget;
 class ScriptWrappable;
 
@@ -54,6 +55,7 @@ typedef v8::Local<v8::FunctionTemplate> (*DomTemplateFunction)(v8::Isolate*);
 typedef void (*RefObjectFunction)(ScriptWrappable*);
 typedef void (*DerefObjectFunction)(ScriptWrappable*);
 typedef void (*TraceFunction)(Visitor*, ScriptWrappable*);
+typedef ActiveScriptWrappable* (*ToActiveScriptWrappableFunction)(v8::Local<v8::Object>);
 typedef void (*ResolveWrapperReachabilityFunction)(v8::Isolate*, ScriptWrappable*, const v8::Persistent<v8::Object>&);
 typedef void (*PreparePrototypeAndInterfaceObjectFunction)(v8::Local<v8::Context>, v8::Local<v8::Object>, v8::Local<v8::Function>, v8::Local<v8::FunctionTemplate>);
 typedef void (*InstallConditionallyEnabledPropertiesFunction)(v8::Local<v8::Object>, v8::Isolate*);
@@ -181,6 +183,13 @@ struct WrapperTypeInfo {
             installConditionallyEnabledPropertiesFunction(prototypeObject, isolate);
     }
 
+    ActiveScriptWrappable* toActiveScriptWrappable(v8::Local<v8::Object> object) const
+    {
+        if (!toActiveScriptWrappableFunction)
+            return nullptr;
+        return toActiveScriptWrappableFunction(object);
+    }
+
     EventTarget* toEventTarget(v8::Local<v8::Object>) const;
 
     void visitDOMWrapper(v8::Isolate* isolate, ScriptWrappable* scriptWrappable, const v8::Persistent<v8::Object>& wrapper) const
@@ -198,6 +207,7 @@ struct WrapperTypeInfo {
     const RefObjectFunction refObjectFunction;
     const DerefObjectFunction derefObjectFunction;
     const TraceFunction traceFunction;
+    const ToActiveScriptWrappableFunction toActiveScriptWrappableFunction;
     const ResolveWrapperReachabilityFunction visitDOMWrapperFunction;
     PreparePrototypeAndInterfaceObjectFunction preparePrototypeAndInterfaceObjectFunction;
     const InstallConditionallyEnabledPropertiesFunction installConditionallyEnabledPropertiesFunction;
@@ -234,6 +244,11 @@ inline ScriptWrappable* toScriptWrappable(v8::Local<v8::Object> wrapper)
     return getInternalField<ScriptWrappable, v8DOMWrapperObjectIndex>(wrapper);
 }
 
+inline ActiveScriptWrappable* toActiveScriptWrappable(v8::Local<v8::Object> wrapper)
+{
+    return getInternalField<WrapperTypeInfo, v8DOMWrapperTypeIndex>(wrapper)->toActiveScriptWrappable(wrapper);
+}
+
 inline const WrapperTypeInfo* toWrapperTypeInfo(const v8::PersistentBase<v8::Object>& wrapper)
 {
     return getInternalField<WrapperTypeInfo, v8DOMWrapperTypeIndex>(wrapper);