Support deprecation + use counters for constructor attributes.

Source/bindings/scripts/v8_attributes.py

Index: Source/bindings/scripts/v8_attributes.py
diff --git a/Source/bindings/scripts/v8_attributes.py b/Source/bindings/scripts/v8_attributes.py
index 6af95ae469f84343c1992d6187e1035d3f8f0be8..baf7b78edfa17c929062abbbb9dc314c5993b69d 100644
--- a/Source/bindings/scripts/v8_attributes.py
+++ b/Source/bindings/scripts/v8_attributes.py
@@ -137,6 +137,7 @@ def generate_attribute(interface, attribute):
     }
 
     if is_constructor_attribute(attribute):
+        generate_constructor_getter(interface, attribute, contents)
         return contents
     if not has_custom_getter:
         generate_getter(interface, attribute, contents)
@@ -396,3 +397,7 @@ def property_attributes(attribute):
 
 def is_constructor_attribute(attribute):
     return attribute.idl_type.endswith('Constructor')
+
+
+def generate_constructor_getter(interface, attribute, contents):
+    contents['needs_constructor_getter_callback'] = contents['measure_as'] or contents['deprecate_as']