First version of PerformanceObserver

Source/core/inspector/InspectorInstrumentation.idl

Index: Source/core/inspector/InspectorInstrumentation.idl
diff --git a/Source/core/inspector/InspectorInstrumentation.idl b/Source/core/inspector/InspectorInstrumentation.idl
index ebff07d322704352c13faf87ff0b162b7930b53d..d9fe98faac6c07ca9ebeb41a19842c1704891e5b 100644
--- a/Source/core/inspector/InspectorInstrumentation.idl
+++ b/Source/core/inspector/InspectorInstrumentation.idl
@@ -168,6 +168,18 @@ interface InspectorInstrumentation {
     void didDeliverMutationRecords(ExecutionContext*);
 
     [AsyncCallTracker, Inline=FastReturn]
+    void didEnqueuePerformanceObserverEntries([Keep] ExecutionContext*, PerformanceObserver*);
+
+    [AsyncCallTracker, Inline=FastReturn]
+    void didClearAllPerformanceObservations([Keep] ExecutionContext*, PerformanceObserver*);
+
+    [AsyncCallTracker, Inline=FastReturn]
+    void willDeliverPerformanceObservations([Keep] ExecutionContext*, PerformanceObserver*);
+
+    [AsyncCallTracker, Inline=FastReturn]
+    void didDeliverPerformanceObservations(ExecutionContext*);
+
+    [AsyncCallTracker, Inline=FastReturn]
     void didPostExecutionContextTask([Keep] ExecutionContext*, ExecutionContextTask*);
 
     [AsyncCallTracker, Inline=FastReturn]