bindings: Add validation for enum Sequence or Array

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:
 IdlTypeBase
  IdlType
  IdlUnionType
  IdlArrayOrSequenceType
@@ skipping 162 matching lines @@
         return self.base_type in IdlType.dictionaries
 
     @property
     def is_enum(self):
         # FIXME: add an IdlEnumType class and a resolve_enums step at end of
         # IdlDefinitions constructor
         return self.name in IdlType.enums
 
     @property
     def enum_values(self):
-        return IdlType.enums[self.name]
+        return IdlType.enums.get(self.name)
 
     @property
     def is_integer_type(self):
         return self.base_type in INTEGER_TYPES
 
     @property
     def is_numeric_type(self):
         return self.base_type in NUMERIC_TYPES
 
     @property
@@ skipping 144 matching lines @@
         self.element_type = state['element_type']
 
     def resolve_typedefs(self, typedefs):
         self.element_type = self.element_type.resolve_typedefs(typedefs)
         return self
 
     @property
     def is_array_or_sequence_type(self):
         return True
 
+    @property
+    def enum_values(self):
+        return self.element_type.enum_values
+
 
 class IdlArrayType(IdlArrayOrSequenceType):
     def __init__(self, element_type):
         super(IdlArrayType, self).__init__(element_type)
 
     def __str__(self):
         return '%s[]' % self.element_type
 
     @property
     def name(self):
@@ skipping 44 matching lines @@
     def is_nullable(self):
         return True
 
     @property
     def name(self):
         return self.inner_type.name + 'OrNull'
 
     def resolve_typedefs(self, typedefs):
         self.inner_type = self.inner_type.resolve_typedefs(typedefs)
         return self