Fix JSON.stringify behavior for Dart Lists faking being arrays by adding stringify method. Test is …

Source/bindings/core/dart/DartJsInterop.cpp

Index: Source/bindings/core/dart/DartJsInterop.cpp
diff --git a/Source/bindings/core/dart/DartJsInterop.cpp b/Source/bindings/core/dart/DartJsInterop.cpp
index bc11363f5329cbf61b3d7981ef0992e53fd1c0dd..21084ab56922857fea6e019d7fe0aca39aeeb84e 100644
--- a/Source/bindings/core/dart/DartJsInterop.cpp
+++ b/Source/bindings/core/dart/DartJsInterop.cpp
@@ -2823,6 +2823,7 @@ v8::Local<v8::FunctionTemplate> dartListTemplate(v8::Isolate* v8Isolate)
         protoTemplate ->Set(v8::String::NewFromUtf8(v8Isolate, "splice"), v8::FunctionTemplate::New(v8Isolate, arraySpliceCallback), v8::DontEnum);
         protoTemplate ->Set(v8::String::NewFromUtf8(v8Isolate, "sort"), v8::FunctionTemplate::New(v8Isolate, arraySortCallback), v8::DontEnum);
         protoTemplate ->Set(v8::String::NewFromUtf8(v8Isolate, "$toJsArray"), v8::FunctionTemplate::New(v8Isolate, toJsArrayCallback), v8::DontEnum);
+        protoTemplate ->Set(v8::String::NewFromUtf8(v8Isolate, "toJSON"), v8::FunctionTemplate::New(v8Isolate, toJsArrayCallback), v8::DontEnum);
         
         // ES6 experimental properties not currently supported that we could support if needed.
         // These would require building separate live proxy objects.