[WIP] bindings: Introduce PropertyBag

Source/bindings/scripts/v8_types.py

Index: Source/bindings/scripts/v8_types.py
diff --git a/Source/bindings/scripts/v8_types.py b/Source/bindings/scripts/v8_types.py
index 4bc44bdb694f2da27b7c98b100b185f34d47b85e..e5e8023e9c18eea4ab77446b4f85188bbae02d14 100644
--- a/Source/bindings/scripts/v8_types.py
+++ b/Source/bindings/scripts/v8_types.py
@@ -501,7 +501,7 @@ def v8_value_to_cpp_value(idl_type, extended_attributes, v8_value, index, isolat
             '{v8_value}->Is{idl_type}() ? '
             'V8{idl_type}::toImpl(v8::Handle<v8::{idl_type}>::Cast({v8_value})) : 0')
     elif idl_type.is_dictionary:
-        cpp_expression_format = 'V8{idl_type}::toImpl({isolate}, {v8_value})'
+        cpp_expression_format = 'V8{idl_type}::toImpl({isolate}, {v8_value}, exceptionState)'
     else:
         cpp_expression_format = (
             'V8{idl_type}::toImplWithTypeCheck({isolate}, {v8_value})')
@@ -544,7 +544,8 @@ def v8_value_to_local_cpp_value(idl_type, extended_attributes, v8_value, variabl
     args = [variable_name, cpp_value]
     if idl_type.base_type == 'DOMString':
         macro = 'TOSTRING_DEFAULT' if used_in_private_script else 'TOSTRING_VOID'
-    elif idl_type.may_raise_exception_on_conversion:
+    elif (idl_type.may_raise_exception_on_conversion and
+          not idl_type.is_dictionary):
         macro = 'TONATIVE_DEFAULT_EXCEPTIONSTATE' if used_in_private_script else 'TONATIVE_VOID_EXCEPTIONSTATE'
         args.append('exceptionState')
     else: