IDL: Use IdlNullableType wrapper to represent nullable types

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 5d599ab428dddef3676a84cbb6d983f34792fac0..d5cda69ea556d461f563881bc21a066c4f2289cc 100644
--- a/Source/bindings/scripts/v8_types.py
+++ b/Source/bindings/scripts/v8_types.py
@@ -39,7 +39,7 @@ Design doc: http://www.chromium.org/developers/design-documents/idl-compiler
 
 import posixpath
 
-from idl_types import IdlTypeBase, IdlType, IdlUnionType, IdlArrayOrSequenceType
+from idl_types import IdlTypeBase, IdlType, IdlUnionType, IdlArrayOrSequenceType, IdlNullableType
 import v8_attributes  # for IdlType.constructor_type_name
 from v8_globals import includes
 
@@ -75,12 +75,16 @@ TYPED_ARRAYS = {
 IdlTypeBase.is_typed_array_element_type = False
 IdlType.is_typed_array_element_type = property(
     lambda self: self.base_type in TYPED_ARRAYS)
+IdlNullableType.is_typed_array_element_type = property(
+    lambda self: self.inner_type.is_typed_array_element_type)
 
 
 IdlTypeBase.is_wrapper_type = False
 IdlType.is_wrapper_type = property(
     lambda self: (self.is_interface_type and
                   self.base_type not in NON_WRAPPER_TYPES))
+IdlNullableType.is_wrapper_type = property(
+    lambda self: self.inner_type.is_wrapper_type)
 
 
 ################################################################################
@@ -230,6 +234,8 @@ IdlUnionType.cpp_type_args = cpp_type_union
 IdlTypeBase.native_array_element_type = None
 IdlArrayOrSequenceType.native_array_element_type = property(
     lambda self: self.element_type)
+IdlNullableType.native_array_element_type = property(
+    lambda self: self.inner_type.native_array_element_type)
 
 
 def cpp_template_type(template, inner_type):
@@ -273,7 +279,7 @@ def implemented_as(idl_type):
     return base_idl_type
 
 
-IdlType.implemented_as = property(implemented_as)
+IdlTypeBase.implemented_as = property(implemented_as)
 
 IdlType.set_implemented_as_interfaces = classmethod(
     lambda cls, new_implemented_as_interfaces:
@@ -283,8 +289,7 @@ IdlType.set_implemented_as_interfaces = classmethod(
 # [GarbageCollected]
 IdlType.garbage_collected_types = set()
 
-IdlTypeBase.is_garbage_collected = False
-IdlType.is_garbage_collected = property(
+IdlTypeBase.is_garbage_collected = property(
     lambda self: self.base_type in IdlType.garbage_collected_types)
 
 IdlType.set_garbage_collected_types = classmethod(
@@ -295,8 +300,7 @@ IdlType.set_garbage_collected_types = classmethod(
 # [WillBeGarbageCollected]
 IdlType.will_be_garbage_collected_types = set()
 
-IdlTypeBase.is_will_be_garbage_collected = False
-IdlType.is_will_be_garbage_collected = property(
+IdlTypeBase.is_will_be_garbage_collected = property(
     lambda self: self.base_type in IdlType.will_be_garbage_collected_types)
 
 IdlType.set_will_be_garbage_collected_types = classmethod(
@@ -381,6 +385,8 @@ IdlUnionType.includes_for_type = property(
                              for member_type in self.member_types]))
 IdlArrayOrSequenceType.includes_for_type = property(
     lambda self: self.element_type.includes_for_type)
+IdlNullableType.includes_for_type = property(
+    lambda self: self.inner_type.includes_for_type)
 
 
 def add_includes_for_type(idl_type):
@@ -593,7 +599,10 @@ def preprocess_idl_type_and_value(idl_type, cpp_value, extended_attributes):
     if idl_type.base_type in ['long long', 'unsigned long long']:
         # long long and unsigned long long are not representable in ECMAScript;
         # we represent them as doubles.
-        idl_type = IdlType('double', is_nullable=idl_type.is_nullable)
+        is_nullable = idl_type.is_nullable
+        idl_type = IdlType('double')
+        if is_nullable:
+            idl_type = IdlNullableType(idl_type)
         cpp_value = 'static_cast<double>(%s)' % cpp_value
     # HTML5 says that unsigned reflected attributes should be in the range
     # [0, 2^31). When a value isn't in this range, a default value (or 0)
@@ -735,7 +744,7 @@ def v8_set_return_value_union(idl_type, cpp_value, extended_attributes=None, scr
 IdlTypeBase.v8_set_return_value = v8_set_return_value
 IdlUnionType.v8_set_return_value = v8_set_return_value_union
 
-IdlType.release = property(lambda self: self.is_interface_type)
+IdlTypeBase.release = property(lambda self: self.is_interface_type)
 IdlUnionType.release = property(
     lambda self: [member_type.is_interface_type
                   for member_type in self.member_types])
@@ -789,7 +798,7 @@ def literal_cpp_value(idl_type, idl_literal):
         return literal_value + 'u'
     return literal_value
 
-IdlType.literal_cpp_value = literal_cpp_value
+IdlTypeBase.literal_cpp_value = literal_cpp_value
 
 
 ################################################################################