DevTools: Implement async call stacks for Promises.

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 e233d8518a37d7221d67b123dffb6d237d9b8c08..6f90894065122b42f24dabc745d949399ed95e3b 100644
--- a/Source/core/inspector/InspectorInstrumentation.idl
+++ b/Source/core/inspector/InspectorInstrumentation.idl
@@ -202,6 +202,15 @@ interface InspectorInstrumentation {
     [Debugger, Inline=FastReturn]
     void didDeliverMutationRecords(ExecutionContext*);
 
+    [Debugger, Inline=FastReturn]
+    void didPostPromiseTask([Keep] ExecutionContext*, ExecutionContextTask*, bool isFulfilled);
+
+    [Debugger, Inline=FastReturn]
+    InspectorInstrumentationCookie willPerformPromiseTask([Keep] ExecutionContext*, ExecutionContextTask*);
+
+    [Debugger, Inline=FastReturn]
+    void didPerformPromiseTask(const InspectorInstrumentationCookie&);
+
     [Timeline, Inline=FastReturn]
     InspectorInstrumentationCookie willEvaluateScript([Keep] Frame*, const String& url, int lineNumber);