Ensure DOMWrapperWorld always exists in all webkit_unit_tests

Source/bindings/v8/V8Binding.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 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
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@@ skipping 716 matching lines @@
         return V8PerIsolateData::mainThreadIsolate();
     return v8::Isolate::GetCurrent();
 }
 
 v8::Isolate* toIsolate(LocalFrame* frame)
 {
     ASSERT(frame);
     return frame->script().isolate();
 }
 
+PassOwnPtr<V8BindingTestScope> V8BindingTestScope::create(v8::Isolate* isolate)
+{
+    return adoptPtr(new V8BindingTestScope(isolate));
+}
+
+V8BindingTestScope::V8BindingTestScope(v8::Isolate* isolate)
+    : m_handleScope(isolate)
+    , m_context(v8::Context::New(isolate))
+    , m_contextScope(m_context)
+    , m_world(DOMWrapperWorld::create())
+    , m_perContextData(V8PerContextData::create(m_context, m_world.get()))
+{
+}
+
 } // namespace WebCore