[bindings] Support is_explicit_nullable for method arguments.

Source/bindings/scripts/v8_methods.py

Index: Source/bindings/scripts/v8_methods.py
diff --git a/Source/bindings/scripts/v8_methods.py b/Source/bindings/scripts/v8_methods.py
index f4253981e4a1c54c1e5af8d2c26bf4a0446f0e82..0e07f6c76c772273f775fa26fd0b47b6ec35fbda 100644
--- a/Source/bindings/scripts/v8_methods.py
+++ b/Source/bindings/scripts/v8_methods.py
@@ -211,10 +211,15 @@ def argument_context(interface, method, argument, index):
         raise Exception('Private scripts supports only primitive types and DOM wrappers.')
 
     set_default_value = argument.set_default_value
+    this_cpp_type = None
+    if idl_type.is_explicit_nullable and not argument.is_variadic:

[Jens Widell, 2015/03/02 08:42:17]

This is not quite what I meant. I meant to do

  this_cpp_type = idl_type.cpp_type_args(...)

and then

  'cpp_type': (
    v8_types.cpp_template_type('Nullable', this_cpp_type)
    if <condition>
    else this_cpp_type),

+        this_cpp_type = v8_types.cpp_template_type('Nullable', idl_type.cpp_type)
+    else:
+        this_cpp_type = idl_type.cpp_type_args(extended_attributes=extended_attributes,
+                                               raw_type=True,
+                                               used_as_variadic_argument=argument.is_variadic)
     return {
-        'cpp_type': idl_type.cpp_type_args(extended_attributes=extended_attributes,
-                                           raw_type=True,
-                                           used_as_variadic_argument=argument.is_variadic),
+        'cpp_type': this_cpp_type,
         'cpp_value': this_cpp_value,
         # FIXME: check that the default value's type is compatible with the argument's
         'set_default_value': set_default_value,
@@ -231,6 +236,7 @@ def argument_context(interface, method, argument, index):
         'is_callback_interface': idl_type.is_callback_interface,
         # FIXME: Remove generic 'Dictionary' special-casing
         'is_dictionary': idl_type.is_dictionary or idl_type.base_type == 'Dictionary',
+        'is_explicit_nullable': idl_type.is_explicit_nullable,
         'is_nullable': idl_type.is_nullable,
         'is_optional': argument.is_optional,
         'is_variadic': argument.is_variadic,