Support for [Clamp] and [EnforceRange] to IDL dictionary.

Source/bindings/scripts/v8_dictionary.py

Index: Source/bindings/scripts/v8_dictionary.py
diff --git a/Source/bindings/scripts/v8_dictionary.py b/Source/bindings/scripts/v8_dictionary.py
index 3fd3e8d49507bf63c0e565e80e4756e766737646..13bd2f4a4e4f2306678194591e31390d07b6e7a0 100644
--- a/Source/bindings/scripts/v8_dictionary.py
+++ b/Source/bindings/scripts/v8_dictionary.py
@@ -88,6 +88,9 @@ def member_context(member):
         'name': member.name,
         'setter_name': setter_name_for_dictionary_member(member),
         'v8_default_value': v8_default_value,
+        'v8_value_to_local_cpp_value': idl_type.v8_value_to_local_cpp_value(
+            member.extended_attributes, member.name + 'Value',
+            member.name, isolate='isolate'),
     }