[Invalidation Tracking] Include DescendantInvalidationSet id in trace events

Source/core/inspector/InspectorTraceEvents.cpp

Index: Source/core/inspector/InspectorTraceEvents.cpp
diff --git a/Source/core/inspector/InspectorTraceEvents.cpp b/Source/core/inspector/InspectorTraceEvents.cpp
index 1b2e8c11b0fa39dc6e48f5e6392a5fe6a834c3c0..2a942c018e069da1d52429de43e4afcc3524abea 100644
--- a/Source/core/inspector/InspectorTraceEvents.cpp
+++ b/Source/core/inspector/InspectorTraceEvents.cpp
@@ -67,6 +67,11 @@ void setNodeInfo(TracedValue* value, Node* node, const char* idFieldName, const
 
 }
 
+String descendantInvalidationSetToIdString(const DescendantInvalidationSet& set)
+{
+    return toHexString(&set);
+}
+
 const char InspectorStyleInvalidatorInvalidateEvent::ElementHasPendingInvalidationList[] = "Element has pending invalidation list";
 const char InspectorStyleInvalidatorInvalidateEvent::InvalidateCustomPseudo[] = "Invalidate custom pseudo element.";
 const char InspectorStyleInvalidatorInvalidateEvent::InvalidationSetMatchedAttribute[] = "Invalidation set matched attribute.";