IDL compiler: Implement proxying at ReferenceType

Bug: 839389
Change-Id: Ibdf190e9f5d670fc9a26e8fda1cca71646ee74cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1700107Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678599}

third_party/blink/renderer/bindings/scripts/web_idl/idl_reference_proxy.py

@@ -27,7 +27,7 @@ class Proxy(object):
             |self|.  If None, no attribute has priority over own attributes.
         """
         if target_attrs is not None:
-            assert isinstance(target_attrs, (tuple, list))
+            assert isinstance(target_attrs, (list, set, tuple))
             assert all(isinstance(attr, str) for attr in target_attrs)
         self._target_object = target_object
         self._target_attrs = target_attrs
@@ -53,6 +53,26 @@ class Proxy(object):
             return getattr(target_object, attribute)
         return object.__getattribute__(self, attribute)
 
+    @staticmethod
+    def get_all_attributes(target_class):
+        """
+        Returns all the attributes of |target_class| including its ancestors'
+        attributes.  Protected attributes (starting with an underscore,
+        including two underscores) are excluded.
+        """
+
+        def collect_attrs_recursively(target_class):
+            attrs_sets = [set(vars(target_class).keys())]
+            for base_class in target_class.__bases__:
+                attrs_sets.append(collect_attrs_recursively(base_class))
+            return set.union(*attrs_sets)
+
+        assert isinstance(target_class, type)
+        return sorted([
+            attr for attr in collect_attrs_recursively(target_class)
+            if not attr.startswith('_')
+        ])
+
     def set_target_object(self, target_object):
         assert self._target_object is None
         assert isinstance(target_object, object)

third_party/blink/renderer/bindings/scripts/web_idl/idl_types.py

@@ -3,7 +3,9 @@
 # found in the LICENSE file.
 
 import exceptions
+
 from blinkbuild.name_style_converter import NameStyleConverter
+
 from .common import WithCodeGeneratorInfo
 from .common import WithDebugInfo
 from .common import WithExtendedAttributes
@@ -378,6 +380,11 @@ class ReferenceType(IdlType, WithIdentifier, Proxy):
     identifier may be resolved to a TypedefType.
     """
 
+    _attrs_to_be_proxied = set(Proxy.get_all_attributes(IdlType)).difference(
+        # attributes not to be proxied
+        set(('code_generator_info', 'debug_info', 'extended_attributes',
+             'is_optional')))
+
     def __init__(self,
                  ref_to_idl_type,
                  is_optional=False,
@@ -392,8 +399,10 @@ class ReferenceType(IdlType, WithIdentifier, Proxy):
             code_generator_info=code_generator_info,
             debug_info=debug_info)
         WithIdentifier.__init__(self, ref_to_idl_type.identifier)
-        # TODO(yukishiino): Set appropriate attributes to proxy.
-        Proxy.__init__(self, target_object=ref_to_idl_type)
+        Proxy.__init__(
+            self,
+            target_object=ref_to_idl_type,
+            target_attrs_with_priority=ReferenceType._attrs_to_be_proxied)
 
 
 class DefinitionType(IdlType, WithIdentifier):