bind-gen: Minor updates on CodeGenerationContext

Renames CodeGenerationContext.property to |property_| in order
to avoid conflict with the built-in property function.

Also adds more utility properties.

Bug: 839389
Change-Id: I166374af1d3dc451b1e783d873f61f5b6aa48c25
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1882188Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709858}

third_party/blink/renderer/bindings/scripts/bind_gen/code_generation_context.py

@@ -53,7 +53,7 @@ class CodeGenerationContext(object):
         cls._computational_attrs = (
             "class_like",
             "member_like",
-            "property",
+            "property_",
         )
 
         # Define public readonly properties of this class.
@@ -123,7 +123,7 @@ class CodeGenerationContext(object):
         for attr in self._computational_attrs:
             value = getattr(self, attr)
             if value is not None:
-                bindings[attr] = value
+                bindings[attr.strip("_")] = value
 
         return bindings
 
@@ -132,15 +132,41 @@ class CodeGenerationContext(object):
         return (self.callback_interface or self.dictionary or self.interface
                 or self.namespace)
 
+    @property
+    def is_return_by_argument(self):
+        if self.return_type is None:
+            return None
+        return_type = self.return_type.unwrap()
+        return return_type.is_dictionary or return_type.is_union
+
+    @property
+    def may_throw_exception(self):
+        if not self.member_like:
+            return None
+        ext_attr = self.member_like.extended_attributes.get("RaisesException")
+        if not ext_attr:
+            return False
+        return (not ext_attr.values
+                or (self.attribute_get and "Getter" in ext_attr.values)
+                or (self.attribute_set and "Setter" in ext_attr.values))
+
     @property
     def member_like(self):
         return (self.attribute or self.constant or self.constructor
                 or self.dict_member or self.operation)
 
     @property
-    def property(self):
+    def property_(self):
         return (self.attribute or self.constant or self.constructor_group
                 or self.dict_member or self.operation_group)
 
+    @property
+    def return_type(self):
+        if self.attribute_get:
+            return self.attribute.idl_type
+        if self.operation:
+            return self.operation.return_type
+        return None
+
 
 CodeGenerationContext.init()