Fix _first_enum_value usage on make_css_property_names.py

This patch fixes make_css_property_names.py to use _first_enum_value
where appropriate so that the value can be updated in the future.

Review URL: https://codereview.chromium.org/1310073003

git-svn-id: svn://svn.chromium.org/blink/trunk@201183 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/build/scripts/css_properties.py

@@ -52,11 +52,12 @@ class CSSProperties(in_generator.Writer):
         self._aliases = [property for property in properties if property['alias_for']]
         properties = [property for property in properties if not property['alias_for']]
 
-        # StylePropertyMetadata additionally assumes there are under 1024 properties.
-        assert len(properties) < 512, 'Property aliasing expects there are under 512 properties.'
-
         # We currently assign 0 to CSSPropertyInvalid
         self._first_enum_value = 1
+
+        # StylePropertyMetadata additionally assumes there are under 1024 properties.
+        assert self._first_enum_value + len(properties) < 512, 'Property aliasing expects there are under 512 properties.'
+
         for offset, property in enumerate(properties):
             property['property_id'] = css_name_to_enum(property['name'])
             property['upper_camel_name'] = camelcase_css_name(property['name'])

third_party/WebKit/Source/build/scripts/make_css_property_names.py

@@ -203,7 +203,7 @@ class CSSPropertyNamesWriter(css_properties.CSSProperties):
         property_offsets = []
         property_names = []
         current_offset = 0
-        for enum_value in range(1, max(enum_value_to_name) + 1):
+        for enum_value in range(self._first_enum_value, max(enum_value_to_name) + 1):
             property_offsets.append(current_offset)
             if enum_value in enum_value_to_name:
                 name = enum_value_to_name[enum_value]