First version of PerformanceObserver

Source/core/inspector/AsyncCallTracker.h

Index: Source/core/inspector/AsyncCallTracker.h
diff --git a/Source/core/inspector/AsyncCallTracker.h b/Source/core/inspector/AsyncCallTracker.h
index 4a15f1c1b1ed98eef9685fc50b17c7b5e543de6d..d90f3c16c1bb5ded84aaa4371e9a86d51fcd9733 100644
--- a/Source/core/inspector/AsyncCallTracker.h
+++ b/Source/core/inspector/AsyncCallTracker.h
@@ -49,6 +49,7 @@ class FormData;
 class HTTPHeaderMap;
 class KURL;
 class MutationObserver;
+class PerformanceObserver;
 class ThreadableLoaderClient;
 class XMLHttpRequest;
 
@@ -86,6 +87,11 @@ public:
     void willDeliverMutationRecords(ExecutionContext*, MutationObserver*);
     void didDeliverMutationRecords() { didFireAsyncCall(); }
 
+    void didEnqueuePerformanceObserverEntries(ExecutionContext*, PerformanceObserver*);
+    void didClearAllPerformanceObservations(ExecutionContext*, PerformanceObserver*);
+    void willDeliverPerformanceObservations(ExecutionContext*, PerformanceObserver*);
+    void didDeliverPerformanceObservations() { didFireAsyncCall(); };
+
     void didPostExecutionContextTask(ExecutionContext*, ExecutionContextTask*);
     void didKillAllExecutionContextTasks(ExecutionContext*);
     void willPerformExecutionContextTask(ExecutionContext*, ExecutionContextTask*);