Fix missing .get() to convert a RefPtr to a ptr for Uint8ClampedArray

Source/bindings/dart/scripts/dart_interface.py

Index: Source/bindings/dart/scripts/dart_interface.py
diff --git a/Source/bindings/dart/scripts/dart_interface.py b/Source/bindings/dart/scripts/dart_interface.py
index 5a3c22fec6508db95e55a6d340da2bcd220bcfe0..c4da90873a697bc5a89c20a92f8ef0ddccbb1e18 100644
--- a/Source/bindings/dart/scripts/dart_interface.py
+++ b/Source/bindings/dart/scripts/dart_interface.py
@@ -948,7 +948,9 @@ def constructor_argument_list(interface, constructor):
     def cpp_argument(argument):
         argument_name = dart_types.check_reserved_name(argument.name)
         idl_type = argument.idl_type
-        if isinstance(idl_type, IdlArrayType):
+        # FIXMEDART: there has to be a cleaner way to check for arraylike
+        # types such as Uint8ClampedArray.
+        if isinstance(idl_type, IdlArrayType) or idl_type.preprocessed_type.is_typed_array_type:
             return '%s.get()' % argument_name
 
         return argument_name