bindings: Support sequence in callback function arguments

third_party/WebKit/Source/bindings/scripts/v8_callback_function.py

 # Copyright 2016 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.
 
 """Generate template values for a callback function.
 
 Design doc: http://www.chromium.org/developers/design-documents/idl-compiler
 """
 
 from v8_globals import includes  # pylint: disable=W0403
 import v8_utilities  # pylint: disable=W0403
 
 CALLBACK_FUNCTION_H_INCLUDES = frozenset([
     'bindings/core/v8/ScopedPersistent.h',
     'platform/heap/Handle.h',
     'wtf/text/WTFString.h',
 ])
 CALLBACK_FUNCTION_CPP_INCLUDES = frozenset([
+    'bindings/core/v8/ExceptionState.h',
     'bindings/core/v8/ScriptState.h',
+    'bindings/core/v8/ToV8.h',
     'bindings/core/v8/V8Binding.h',
     'wtf/Assertions.h',
 ])
 
 
 def callback_function_context(callback_function):
     includes.clear()
     includes.update(CALLBACK_FUNCTION_CPP_INCLUDES)
     idl_type = callback_function.idl_type
     idl_type_str = str(idl_type)
+
     context = {
         'cpp_class': callback_function.name,
         'cpp_includes': sorted(CALLBACK_FUNCTION_CPP_INCLUDES),
         'header_includes': sorted(CALLBACK_FUNCTION_H_INCLUDES),
         'idl_type': idl_type_str,
-        'return_cpp_type': (idl_type.cpp_type + '&') if idl_type.cpp_type != 'void' else None,
-        'return_value': idl_type.v8_value_to_local_cpp_value(
-            callback_function.extended_attributes, 'v8ReturnValue', 'cppValue',
-            bailout_return_value="false") if idl_type.cpp_type != 'void' else None,
         'v8_class': v8_utilities.v8_class_name(callback_function),
     }
-    context.update(arguments_context(callback_function.arguments, context['return_cpp_type']))
+
+    if idl_type_str != 'void':
+        context.update({
+            'return_cpp_type': idl_type.cpp_type + '&',
+            'return_value': idl_type.v8_value_to_local_cpp_value(
+                callback_function.extended_attributes,
+                'v8ReturnValue', 'cppValue',
+                isolate='scriptState->isolate()', bailout_return_value='false'),
+        })
+
+    context.update(arguments_context(callback_function.arguments, context.get('return_cpp_type')))
     return context
 
 
 def arguments_context(arguments, return_cpp_type):
     def argument_context(argument):
         return {
             'argument_name': '%sArgument' % argument.name,
             'cpp_value_to_v8_value': argument.idl_type.cpp_value_to_v8_value(
                 argument.name, isolate='scriptState->isolate()',
                 creation_context='scriptState->context()->Global()'),
         }
 
     argument_declarations = ['ScriptState* scriptState', 'ScriptWrappable* scriptWrappable']
     argument_declarations.extend(
         '%s %s' % (argument.idl_type.callback_cpp_type, argument.name)
         for argument in arguments)
     if return_cpp_type:
         argument_declarations.append('%s returnValue' % return_cpp_type)
     return {
         'argument_declarations': argument_declarations,
         'arguments': [argument_context(argument) for argument in arguments],
     }