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 80d64e8f1ce9a97c4ecf6a290f6b976d263cfc4a..e049395efd94b4131ad867dd810873cbf7ac726b 100644
--- a/Source/core/inspector/AsyncCallStackTracker.h
+++ b/Source/core/inspector/AsyncCallStackTracker.h
@@ -103,6 +103,9 @@ public:
     void didKillAllExecutionContextTasks(ExecutionContext*);
     void willPerformExecutionContextTask(ExecutionContext*, ExecutionContextTask*);
 
+    void didEnqueueV8AsyncTask(ExecutionContext*, const String& eventName, int id, const ScriptValue& callFrames);
+    void willHandleV8AsyncTask(ExecutionContext*, const String& eventName, int id);
+
     void didFireAsyncCall();
     void clear();
 
@@ -113,7 +116,7 @@ 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*);