Dartium support for manual custom element upgrades.

Source/bindings/dart/DartNativeUtilities.cpp

Index: Source/bindings/dart/DartNativeUtilities.cpp
diff --git a/Source/bindings/dart/DartNativeUtilities.cpp b/Source/bindings/dart/DartNativeUtilities.cpp
index 3adb0dce7d6efc889fb1f3bf0495eb59ed3fff8e..730d5c4f2847117046d4af9b86dcce264d3af658 100644
--- a/Source/bindings/dart/DartNativeUtilities.cpp
+++ b/Source/bindings/dart/DartNativeUtilities.cpp
@@ -237,6 +237,36 @@ fail:
     ASSERT_NOT_REACHED();
 }
 
+void changeElementWrapper(Dart_NativeArguments args)
+{
+    Dart_Handle exception = 0;
+    {
+        Dart_Handle elementWrapper = Dart_GetNativeArgument(args, 0);
+        if (!DartDOMWrapper::subtypeOf(elementWrapper, DartHTMLElement::dartClassId)) {
+            exception = Dart_NewStringFromCString("Invalid class: expected instance of HtmlElement");
+            goto fail;
+        }
+
+        Dart_Handle wrapperType = Dart_GetNativeArgument(args, 1);
+        if (!Dart_IsType(wrapperType)) {
+            exception = Dart_NewStringFromCString("Expected instance of Type");
+            goto fail;
+        }
+
+        Dart_Handle newWrapper = DartCustomElementWrapper<HTMLElement>::changeElementWrapper(elementWrapper, wrapperType);
+        if (Dart_IsError(newWrapper)) {
+            exception = newWrapper;
+            goto fail;
+        }
+        Dart_SetReturnValue(args, newWrapper);
+        return;
+    }
+
+fail:
+    Dart_ThrowException(exception);
+    ASSERT_NOT_REACHED();
+}
+
 } // namespace DartNativeUtilitiesInternal
 
 namespace DartWindowInternal {
@@ -274,6 +304,8 @@ Dart_NativeFunction domIsolateHtmlResolver(Dart_Handle name, int argumentCount,
         return DartNativeUtilitiesInternal::createElement;
     if (argumentCount == 1 && str == "Utils_initializeCustomElement")
         return DartNativeUtilitiesInternal::initializeCustomElement;
+    if (argumentCount == 2 && str == "Utils_changeElementWrapper")
+        return DartNativeUtilitiesInternal::changeElementWrapper;
     if (argumentCount == 1 && str == "Utils_spawnDomUri")
         return DartNativeUtilitiesInternal::spawnDomUri;
     if (argumentCount == 1 && str == "Window_history_cross_frame_Getter")