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 0f98d181f0a27fe4b9b2eea4ce4dc67671d68113..da3e79c15ca31c6ffcd8d2e918fdd0f56d1dccbd 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -190,6 +190,8 @@
 #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"
@@ -4958,6 +4960,8 @@ void Document::tasksWereResumed()
         m_scriptedAnimationController->resume();
 
     MutationObserver::resumeSuspendedObservers();
+    if (m_domWindow)
+        DOMWindowPerformance::performance(*m_domWindow)->resumeSuspendedObservers();
 }
 
 // FIXME: suspendScheduledTasks(), resumeScheduledTasks(), tasksNeedSuspension()