IDL: Add [FlexibleArrayBufferView] and use for bufferSubData

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 90cf991416ddceae262864238f3a63404b031f60..fbfaca4091d55b3145d690961d56bc8780a3096b 100644
--- a/Source/bindings/scripts/v8_types.py
+++ b/Source/bindings/scripts/v8_types.py
@@ -181,8 +181,8 @@ def cpp_type(idl_type, extended_attributes=None, raw_type=False, used_as_rvalue_
             return 'String'
         return 'V8StringResource<%s>' % string_mode()
 
-    if idl_type.is_array_buffer_or_view and raw_type:
-        return idl_type.implemented_as + '*'
+    if idl_type.base_type == 'ArrayBufferView' and 'FlexibleArrayBufferView' in extended_attributes:
+        return 'FlexibleArrayBufferView'
     if idl_type.is_interface_type:
         implemented_as_class = idl_type.implemented_as
         if raw_type or (used_as_rvalue_type and idl_type.is_garbage_collected):
@@ -374,6 +374,9 @@ def includes_for_type(idl_type, extended_attributes=None):
     base_idl_type = idl_type.base_type
     if base_idl_type in INCLUDES_FOR_TYPE:
         return INCLUDES_FOR_TYPE[base_idl_type]
+    if base_idl_type == 'ArrayBufferView' and 'FlexibleArrayBufferView' in extended_attributes:
+        return set(['bindings/core/v8/V8ArrayBufferView.h',
+                    'core/dom/FlexibleArrayBufferView.h'])
     if idl_type.is_basic_type:
         return set()
     if base_idl_type.endswith('ConstructorConstructor'):
@@ -497,6 +500,7 @@ V8_VALUE_TO_CPP_VALUE = {
     # Interface types
     'Dictionary': 'Dictionary({v8_value}, {isolate}, exceptionState)',
     'EventTarget': 'toEventTarget({isolate}, {v8_value})',
+    'FlexibleArrayBufferView': 'toFlexibleArrayBufferView({isolate}, {v8_value}, {variable_name}, SMALL_ARRAY_BUFFER_VIEW_STORAGE({v8_value}))',
     'NodeFilter': 'toNodeFilter({v8_value}, info.Holder(), ScriptState::current({isolate}))',
     'Promise': 'ScriptPromise::cast(ScriptState::current({isolate}), {v8_value})',
     'SerializedScriptValue': 'SerializedScriptValueFactory::instance().create({v8_value}, 0, 0, exceptionState, {isolate})',
@@ -550,6 +554,9 @@ def v8_value_to_cpp_value(idl_type, extended_attributes, v8_value, variable_name
     idl_type = idl_type.preprocessed_type
     base_idl_type = idl_type.as_union_type.name if idl_type.is_union_type else idl_type.base_type
 
+    if base_idl_type == 'ArrayBufferView' and 'FlexibleArrayBufferView' in extended_attributes:
+        base_idl_type = 'FlexibleArrayBufferView'
+
     if idl_type.is_integer_type:
         configuration = 'NormalConversion'
         if 'EnforceRange' in extended_attributes:
@@ -645,6 +652,8 @@ def v8_value_to_local_cpp_value(idl_type, extended_attributes, v8_value, variabl
                     check_expression = '!%s.prepare()' % variable_name
     elif not idl_type.v8_conversion_is_trivial:
         raise Exception('unclassified V8 -> C++ conversion for IDL type: %s' % idl_type.name)
+    elif idl_type.base_type == 'ArrayBufferView' and 'FlexibleArrayBufferView' in extended_attributes:
+        set_expression = cpp_value
     else:
         assign_expression = cpp_value