Pass DOMWinow to PerformanceLongTaskTiming for attribution

third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.h

Index: third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.h
diff --git a/third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.h b/third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.h
index 212884f7195e85f99aae4402b7ff907ca8028ef7..e206758821d2b1b0b0e69a9337171eca0368556d 100644
--- a/third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.h
+++ b/third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.h
@@ -12,6 +12,7 @@
 
 namespace blink {
 
+class DOMWindow;
 class ExecutionContext;
 class Frame;
 class LocalFrame;
@@ -48,9 +49,9 @@ class CORE_EXPORT InspectorWebPerfAgent final
 
  private:
   bool m_enabled;
-  String sanitizedLongTaskName(
+  std::pair<String, DOMWindow*> sanitizedAttribution(
       const HeapHashSet<Member<Location>>& frameContextLocations,
-      Frame* rootFrame);
+      Frame* observerFrame);
 
   Member<InspectedFrames> m_inspectedFrames;
   HeapHashSet<Member<Location>> m_frameContextLocations;