DevTools: Async call stacks for Promises and Object.observe.

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 7ca58d45fd2502bc64c9fe440ffdc7e7388d7172..0919a58e1085b706f9895958a7a8a0799bdaef6c 100644
--- a/Source/core/inspector/AsyncCallStackTracker.h
+++ b/Source/core/inspector/AsyncCallStackTracker.h
@@ -98,6 +98,9 @@ public:
     void didClearAllMutationRecords(ExecutionContext*, MutationObserver*);
     void willDeliverMutationRecords(ExecutionContext*, MutationObserver*);
 
+    void didEnqueueV8AsyncTask(ExecutionContext*, const String& eventName, int id, const ScriptValue& callFrames);
+    void willHandleV8AsyncTask(ExecutionContext*, const String& eventName, int id);
+
     void didFireAsyncCall();
     void clear();
 
@@ -108,7 +111,7 @@ private:
     void setCurrentAsyncCallChain(ExecutionContext*, PassRefPtr<AsyncCallChain>);
     void clearCurrentAsyncCallChain();
     static void ensureMaxAsyncCallChainDepth(AsyncCallChain*, unsigned);
-    static bool validateCallFrames(const ScriptValue& callFrames);
+    bool validateCallFrames(const ScriptValue& callFrames);
 
     class ExecutionContextData;
     ExecutionContextData* createContextDataIfNeeded(ExecutionContext*);