Ensure DOMWrapperWorld always exists in all webkit_unit_tests

Source/bindings/v8/V8Binding.cpp

Index: Source/bindings/v8/V8Binding.cpp
diff --git a/Source/bindings/v8/V8Binding.cpp b/Source/bindings/v8/V8Binding.cpp
index 33727d87e9d721e6535f7b15daf130df6bcb9828..6e04b2f7ac7d6456b641e140e2e5a9c624374719 100644
--- a/Source/bindings/v8/V8Binding.cpp
+++ b/Source/bindings/v8/V8Binding.cpp
@@ -734,4 +734,18 @@ v8::Isolate* toIsolate(LocalFrame* 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