[tracing] Adding class-wise memory statistics to blink gc memory dumps

Source/platform/heap/Visitor.h

Index: Source/platform/heap/Visitor.h
diff --git a/Source/platform/heap/Visitor.h b/Source/platform/heap/Visitor.h
index 60cca5cd57156ff459003a7945c3c9fef89c6f21..86d6610bb9c94e462d2c14e0ad67f9d091ff7b41 100644
--- a/Source/platform/heap/Visitor.h
+++ b/Source/platform/heap/Visitor.h
@@ -42,10 +42,8 @@
 #include "wtf/HashMap.h"
 #include "wtf/HashTraits.h"
 #include "wtf/TypeTraits.h"
-#if ENABLE(GC_PROFILING)
 #include "wtf/InstanceCounter.h"
 #include "wtf/text/WTFString.h"
-#endif
 
 namespace blink {
 
@@ -396,6 +394,14 @@ public:
 
     inline MarkingMode markingMode() const { return m_markingMode; }
 
+    void setHostInfo(void* object, const String& name)
+    {
+        m_hostObject = object;
+        m_hostName = name;
+    }
+
+    inline bool isGlobalMarkingVisitor() const { return m_isGlobalMarkingVisitor; }
+
 protected:
     explicit Visitor(MarkingMode markingMode)
         : m_markingMode(markingMode)
@@ -403,6 +409,9 @@ protected:
 
     virtual void registerWeakCellWithCallback(void**, WeakCallback) = 0;
 
+    void* m_hostObject;
+    String m_hostName;
+
 private:
     static Visitor* fromHelper(VisitorHelper<Visitor>* helper) { return static_cast<Visitor*>(helper); }
 
@@ -410,7 +419,6 @@ private:
     bool m_isGlobalMarkingVisitor;
 };
 
-#if ENABLE(GC_PROFILING)
 template<typename T>
 struct TypenameStringTrait {
     static const String& get()
@@ -419,7 +427,6 @@ struct TypenameStringTrait {
         return typenameString;
     }
 };
-#endif
 
 } // namespace blink