Support merged Dart-JS callstacks

Source/bindings/dart/DartUtilities.h

 // Copyright 2011, Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //    * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //    * Redistributions in binary form must reproduce the above
@@ skipping 219 matching lines @@
     // FIXMEDART: Should have a variant that takes a Dart_NativeArguments to avoid TLS.
     static DartScriptState* currentScriptState();
 
     static bool processingUserGesture();
 
     static PassRefPtr<ScriptArguments> createScriptArguments(Dart_Handle argument, Dart_Handle& exception);
 
     static PassRefPtr<ScriptCallStack> createScriptCallStack();
     static ScriptCallFrame getTopFrame(Dart_StackTrace, Dart_Handle& exception);
     static ScriptCallFrame toScriptCallFrame(Dart_ActivationFrame, Dart_Handle& exception);
-
+    static size_t currentStackDepth();
     static const uint8_t* fullSnapshot(LocalFrame*);
 
     static Dart_Handle canonicalizeUrl(Dart_Handle library, Dart_Handle urlHandle, String url);
 
     static void reportProblem(ExecutionContext*, const String&, int line = 0, int col = 0);
     static void reportProblem(ExecutionContext*, Dart_Handle);
     static void reportProblem(ExecutionContext*, Dart_Handle, const String& sourceURL);
 
     static Dart_Handle invalidNumberOfArgumentsException()
     {
@@ skipping 627 matching lines @@
     Dart_Isolate m_isolate;
     Dart_Isolate m_previousIsolate;
 };
 
 class V8Scope {
 public:
     explicit V8Scope(DartDOMData*, v8::Handle<v8::Context>);
     V8Scope(DartDOMData*);
     ~V8Scope();
 private:
+    void incrementRecursionLevel();
+
     v8::Isolate* m_v8Isolate;
     DartDOMData* m_dartDOMData;
     v8::HandleScope m_handleScope;
     v8::Context::Scope m_contextScope;
     V8RecursionScope m_recursionScope;
 };
 
 struct DartNativeEntry {
     Dart_NativeFunction nativeFunction;
     intptr_t argumentCount;
@@ skipping 56 matching lines @@
     timerStop = currentTimeMS();  \
     fprintf(stdout, "%s %.3f ms\n", msg, (timerStop - timerStart));
 #else
 #define DART_START_TIMER()
 #define DART_RECORD_TIMER(msg)
 #endif
 
 } // namespace WebCore
 
 #endif // DartUtilities_h