Extend ScalarValueString handling to include constructors.

Source/bindings/scripts/idl_types.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 """IDL type handling.
 
 Classes:
 IdlType
 IdlUnionType
 """
 
@@ skipping 52 matching lines @@
     'unrestricted float': 'UnrestrictedFloat',
     'double': 'Double',
     'unrestricted double': 'UnrestrictedDouble',
     'DOMString': 'String',
     'ByteString': 'ByteString',
     'ScalarValueString': 'ScalarValueString',
     'object': 'Object',
     'Date': 'Date',
 }
 
+STRING_TYPES = frozenset([
+    # http://heycam.github.io/webidl/#es-interface-call (step 10.11)
+    # (Interface object [[Call]] method's string types.)
+    'String',
+    'ByteString',
+    'ScalarValueString',
+])
+
 
 ################################################################################
 # Inheritance
 ################################################################################
 
 ancestors = defaultdict(list)  # interface_name -> ancestors
 
 def inherits_interface(interface_name, ancestor_name):
     return (interface_name == ancestor_name or
             ancestor_name in ancestors[interface_name])
@@ skipping 105 matching lines @@
         # http://www.w3.org/TR/WebIDL/#idl-interface
         # In C++ these are RefPtr or PassRefPtr types.
         return not(self.is_basic_type or
                    self.is_composite_type or
                    self.is_callback_function or
                    self.is_enum or
                    self.name == 'Object' or
                    self.name == 'Promise')  # Promise will be basic in future
 
     @property
+    def is_string_type(self):
+        return self.base_type_name in STRING_TYPES
+
+    @property
+    def may_raise_exception_on_conversion(self):
+        return (self.is_integer_type or
+                self.name in ('ByteString', 'ScalarValueString'))
+
+    @property
     def is_union_type(self):
         return isinstance(self, IdlUnionType)
 
     @property
+    def base_type_name(self):
+        base_type = self.base_type
+        return TYPE_NAMES.get(base_type, base_type)
+
+    @property
     def name(self):
         """Return type name.
 
         http://heycam.github.io/webidl/#dfn-type-name
         """
-        base_type = self.base_type
-        base_type_name = TYPE_NAMES.get(base_type, base_type)
+        base_type_name = self.base_type_name
         if self.is_array:
             return base_type_name + 'Array'
         if self.is_sequence:
             return base_type_name + 'Sequence'
         if self.is_nullable:
             return base_type_name + 'OrNull'
         return base_type_name
 
     @classmethod
     def set_callback_functions(cls, new_callback_functions):
@@ skipping 93 matching lines @@
 
     @property
     def name(self):
         return 'Or'.join(member_type.name for member_type in self.member_types)
 
     def resolve_typedefs(self, typedefs):
         self.member_types = [
             typedefs.get(member_type, member_type)
             for member_type in self.member_types]
         return self