Add 'storage_only' template to make_computed_style_base.py.

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

Index: third_party/WebKit/Source/build/scripts/make_computed_style_base.py
diff --git a/third_party/WebKit/Source/build/scripts/make_computed_style_base.py b/third_party/WebKit/Source/build/scripts/make_computed_style_base.py
index 21bc41b38dba82ee79a02d97aeaa9c145c945538..f766782e841ed6f211bf7cfe2f83b305a7d12bf9 100755
--- a/third_party/WebKit/Source/build/scripts/make_computed_style_base.py
+++ b/third_party/WebKit/Source/build/scripts/make_computed_style_base.py
@@ -27,6 +27,7 @@ NONPROPERTY_FIELDS = [
     {'name': 'hasVariableReferenceFromNonInheritedProperty', 'field': {'template': 'monotonic_flag'}},
     # Explicitly inherits a non-inherited property
     {'name': 'hasExplicitlyInheritedProperties', 'field': {'template': 'monotonic_flag'}},
+    {'name': 'emptyState', 'field': {'template': 'storage_only', 'size': 1}},

[sashab, 2017/03/13 07:57:11]

# These properties only have generated storage, and their methods are
handwritten in ComputedStyle.
# TODO(shend): Remove these fields and delete the 'storage_only' template.

[shend, 2017/03/14 22:20:06]

Done.

 ]
 
 
@@ -204,8 +205,8 @@ def _create_nonproperty_field(property_):
     """
     Create a nonproperty field from its name and return the Field object.
     """
-    # TODO(shend): Make this work for nonflags
-    assert property_['field']['template'] in ('flag', 'monotonic_flag'), \
+    # TODO(shend): Make this work for other templates (need to compute size correctly)
+    assert property_['field']['template'] in ('flag', 'monotonic_flag', 'storage_only'), \
         "Nonproperties with arbitrary templates are not yet supported"
     member_name = 'm_' + property_['name']
     field_name_upper = upper_first_letter(property_['name'])
@@ -216,7 +217,7 @@ def _create_nonproperty_field(property_):
         property_name=property_['name'],
         type_name='bool',
         template=property_['field']['template'],
-        size=1,
+        size=property_['field'].get('size', 1),

[sashab, 2017/03/13 07:57:11]

Can you document somewhere (like at the top of the json5 file where it's
defined) that if this is not specified, it defaults to 1? Otherwise I think it
should fail, "a size must be specified" kind of thing

[shend, 2017/03/14 22:20:06]

Done.

         default_value='false',
         getter_method_name=property_['name'],
         setter_method_name='set' + field_name_upper,