First version of PerformanceObserver

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index b4ebe61b5de024fe90943ac5d6f4081293bcadb7..f73621be5ad782bb86344e3065f593e3636ce652 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -189,6 +189,8 @@
 #include "core/svg/SVGDocumentExtensions.h"
 #include "core/svg/SVGTitleElement.h"
 #include "core/svg/SVGUseElement.h"
+#include "core/timing/DOMWindowPerformance.h"
+#include "core/timing/Performance.h"
 #include "core/workers/SharedWorkerRepositoryClient.h"
 #include "core/xml/parser/XMLDocumentParser.h"
 #include "platform/DateComponents.h"
@@ -5056,6 +5058,8 @@ void Document::tasksWereResumed()
         m_scriptedAnimationController->resume();
 
     MutationObserver::resumeSuspendedObservers();
+    if (m_domWindow)
+        DOMWindowPerformance::performance(*m_domWindow)->resumeSuspendedObservers();
 }
 
 // FIXME: suspendScheduledTasks(), resumeScheduledTasks(), tasksNeedSuspension()