[WIP] IDL: Add limited serializer support and use for RTCIceCandidate

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 646d7fc450cb5cbf9be10319993338d7071568d4..c2f8312c743f818c09b512c94d686fa76ea02e8f 100644
--- a/Source/bindings/scripts/v8_types.py
+++ b/Source/bindings/scripts/v8_types.py
@@ -92,6 +92,7 @@ CPP_TYPE_SAME_AS_IDL_TYPE = set([
     'float',
     'long long',
     'unsigned long long',
+    'V8ObjectBuilder',
 ])
 CPP_INT_TYPES = set([
     'byte',
@@ -223,11 +224,15 @@ def cpp_type_initializer(idl_type):
     if base_idl_type == 'boolean':
         return ' = false'
     if (base_idl_type in NON_WRAPPER_TYPES or
-        base_idl_type in CPP_SPECIAL_CONVERSION_RULES or
-        base_idl_type == 'any' or
-        idl_type.is_string_type or
-        idl_type.is_enum):
+            base_idl_type in CPP_SPECIAL_CONVERSION_RULES or
+            base_idl_type == 'any' or
+            idl_type.is_string_type or
+            idl_type.is_enum or
+            idl_type.is_dictionary or
+            idl_type.is_union_type):
         return ''
+    if base_idl_type == 'V8ObjectBuilder':
+        return '(info.GetIsolate())'
     return ' = nullptr'
 
 
@@ -363,6 +368,7 @@ INCLUDES_FOR_TYPE = {
     'SerializedScriptValue': set(['bindings/core/v8/SerializedScriptValue.h',
                                   'bindings/core/v8/SerializedScriptValueFactory.h']),
     'ScriptValue': set(['bindings/core/v8/ScriptValue.h']),
+    'V8ObjectBuilder': set(['bindings/core/v8/V8ObjectBuilder.h']),
 }
 
 
@@ -661,7 +667,7 @@ def use_output_parameter_for_result(idl_type):
     """True when methods/getters which return the given idl_type should
     take the output argument.
     """
-    return idl_type.is_dictionary or idl_type.is_union_type
+    return idl_type.is_dictionary or idl_type.is_union_type or idl_type.base_type == 'V8ObjectBuilder'
 
 IdlTypeBase.use_output_parameter_for_result = property(use_output_parameter_for_result)
 
@@ -800,6 +806,8 @@ V8_SET_RETURN_VALUE = {
     'NullableDictionary': 'v8SetReturnValue(info, result.get())',
     # Union types or dictionaries
     'DictionaryOrUnion': 'v8SetReturnValue(info, result)',
+    # Special container used for toJSON() resulting from serializer definitions.
+    'V8ObjectBuilder': 'v8SetReturnValue(info, result.v8Value())',
 }