Mojo cpp bindings: support Clone() for structs and arrays which don't contain handles.

mojo/public/tools/bindings/generators/mojom_cpp_generator.py

 # Copyright 2013 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.
 
 """Generates C++ source files from a mojom.Module."""
 
 import mojom.generate.generator as generator
 import mojom.generate.module as mojom
 import mojom.generate.pack as pack
 from mojom.generate.template_expander import UseJinja
@@ skipping 271 matching lines @@
     "cpp_wrapper_type": GetCppWrapperType,
     "default_value": DefaultValue,
     "expected_array_size": generator.ExpectedArraySize,
     "expression_to_text": ExpressionToText,
     "get_array_validate_params": GetArrayValidateParams,
     "get_name_for_kind": GetNameForKind,
     "get_pad": pack.GetPad,
     "has_callbacks": mojom.HasCallbacks,
     "should_inline": ShouldInlineStruct,
     "is_any_array_kind": mojom.IsAnyArrayKind,
+    "is_cloneable_kind": mojom.IsCloneableKind,
     "is_enum_kind": mojom.IsEnumKind,
     "is_move_only_kind": mojom.IsMoveOnlyKind,
     "is_any_handle_kind": mojom.IsAnyHandleKind,
     "is_interface_kind": mojom.IsInterfaceKind,
     "is_interface_request_kind": mojom.IsInterfaceRequestKind,
     "is_nullable_kind": mojom.IsNullableKind,
     "is_object_kind": mojom.IsObjectKind,
     "is_string_kind": mojom.IsStringKind,
+    "is_struct_kind": mojom.IsStructKind,
     "is_struct_with_handles": IsStructWithHandles,
     "struct_size": lambda ps: ps.GetTotalSize() + _HEADER_SIZE,
     "struct_from_method": generator.GetStructFromMethod,
     "response_struct_from_method": generator.GetResponseStructFromMethod,
     "stylize_method": generator.StudlyCapsToCamel,
     "to_all_caps": generator.CamelCaseToAllCaps,
   }
 
   def GetJinjaExports(self):
     return {
@@ skipping 17 matching lines @@
 
   @UseJinja("cpp_templates/module.cc.tmpl", filters=cpp_filters)
   def GenerateModuleSource(self):
     return self.GetJinjaExports()
 
   def GenerateFiles(self, args):
     self.Write(self.GenerateModuleHeader(), "%s.h" % self.module.name)
     self.Write(self.GenerateModuleInternalHeader(),
         "%s-internal.h" % self.module.name)
     self.Write(self.GenerateModuleSource(), "%s.cc" % self.module.name)