DevTools: Implement async call stacks for Promises.

Source/core/inspector/AsyncCallStackTracker.h

Index: Source/core/inspector/AsyncCallStackTracker.h
diff --git a/Source/core/inspector/AsyncCallStackTracker.h b/Source/core/inspector/AsyncCallStackTracker.h
index cf9e677cabc776f513eeba87fb2890245ff84aa5..7c672983957e51b1af05f295ba2318358bfe91f3 100644
--- a/Source/core/inspector/AsyncCallStackTracker.h
+++ b/Source/core/inspector/AsyncCallStackTracker.h
@@ -44,6 +44,7 @@ namespace WebCore {
 class EventListener;
 class EventTarget;
 class ExecutionContext;
+class ExecutionContextTask;
 class MutationObserver;
 class XMLHttpRequest;
 
@@ -99,6 +100,9 @@ public:
     void didClearAllMutationRecords(ExecutionContext*, MutationObserver*);
     void willDeliverMutationRecords(ExecutionContext*, MutationObserver*);
 
+    void didPostPromiseTask(ExecutionContext*, ExecutionContextTask*, bool isFulfilled, const ScriptValue& callFrames);
+    void willPerformPromiseTask(ExecutionContext*, ExecutionContextTask*);
+
     void didFireAsyncCall();
     void clear();