Let the TextTrackCue constructor return a VTTCue

Source/bindings/v8/custom/V8TextTrackCueCustom.cpp

Index: Source/bindings/v8/custom/V8TextTrackCueCustom.cpp
diff --git a/Source/bindings/v8/custom/V8TextTrackCueCustom.cpp b/Source/bindings/v8/custom/V8TextTrackCueCustom.cpp
index 0ccc04e67607f955b3c68b25add624aa3cb50d8f..905b2f3c91744cc98ad62bb1481e169110beee7e 100644
--- a/Source/bindings/v8/custom/V8TextTrackCueCustom.cpp
+++ b/Source/bindings/v8/custom/V8TextTrackCueCustom.cpp
@@ -40,4 +40,23 @@ v8::Handle<v8::Value> toV8(TextTrackCue* impl, v8::Handle<v8::Object> creationCo
     return toV8(toVTTCue(impl), creationContext, isolate);
 }
 
+// Custom constructor to make new TextTrackCue(...) return a VTTCue. This is legacy
+// compat, not per spec, and should be removed at the earliest opportunity.
+void V8TextTrackCue::constructorCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
+{
+    if (UNLIKELY(info.Length() < 3)) {
+        throwTypeError(ExceptionMessages::failedToExecute("Constructor", "TextTrackCue", ExceptionMessages::notEnoughArguments(3, info.Length())), info.GetIsolate());
+        return;
+    }
+    V8TRYCATCH_VOID(double, startTime, static_cast<double>(info[0]->NumberValue()));
+    V8TRYCATCH_VOID(double, endTime, static_cast<double>(info[1]->NumberValue()));
+    V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<>, text, info[2]);
+
+    Document& document = *toDocument(getExecutionContext());
+    UseCounter::count(document, UseCounter::TextTrackCueConstructor);
+    VTTCue* impl = VTTCue::create(document, startTime, endTime, text).leakRef();
+    v8::Handle<v8::Object> wrapper = wrap(impl, info.Holder(), info.GetIsolate());
+    info.GetReturnValue().Set(wrapper);
+}
+
 } // namespace WebCore