Made a generator for CSSPropertyDescriptor.cpp

third_party/WebKit/Source/core/css/CSSProperties.in

Index: third_party/WebKit/Source/core/css/CSSProperties.in
diff --git a/third_party/WebKit/Source/core/css/CSSProperties.in b/third_party/WebKit/Source/core/css/CSSProperties.in
index 76b3e3b41858cc47cf4fe7617025bade64800f98..f46c40a8fe708a99d4b570bb19e323ec3ec6db0b 100644
--- a/third_party/WebKit/Source/core/css/CSSProperties.in
+++ b/third_party/WebKit/Source/core/css/CSSProperties.in
@@ -23,6 +23,19 @@
 // The property is a shorthand for several other properties.
 
 
+// - generated_api_class[=group]
+// We have a CSSPropertyAPI interface which contains parsing functions for
+// properties, and will be implemented by all CSS properties.
+// * When we want to generate the .h file for a property, we add this flag.

[sashab, 2016/12/08 23:56:35]

Small nit: instead of saying "we", phrase stuff like following a recipe, e.g.

* To add a property to the API, add this flag to the property

Also we're not generating the .h files in this patch anymore :)

[aazzam, 2016/12/09 00:44:39]

tried re-wording, ptal :)

+// * Properties which have the same parsing logic should be grouped together when
+//   generating an API .h file for the property. If the specified property is in
+//   a group, the  value of that flag should be set to the group name - all of

[sashab, 2016/12/08 23:56:35]

Remove double space before value

Also explain that the name here has to be the name of the file containing the
API class, as well as the name of that class

The comment doesn't have to be long, it just has to be thorough :)

+//   the properties with this flag value will inherit from a class with this name.
+// * Properties which are not generated do not get this flag.
+// TODO(aazzam): Once all .h files are generated, change this so that only grouped
+// properties have this flag and introduce a 'not_generated' flag instead.
+
+
 // - keyword_only
 // These properties only store keyword values. This is used when
 // generating the ComputedStyle storage for the property. The initial
@@ -468,10 +481,10 @@ z-index interpolable, type_name=int, custom_all
 -webkit-margin-start direction_aware
 -webkit-margin-before direction_aware
 -webkit-margin-after direction_aware
--webkit-padding-end direction_aware
--webkit-padding-start direction_aware
--webkit-padding-before direction_aware
--webkit-padding-after direction_aware
+-webkit-padding-end direction_aware, generated_api_class=WebkitPadding
+-webkit-padding-start direction_aware, generated_api_class=WebkitPadding
+-webkit-padding-before direction_aware, generated_api_class=WebkitPadding
+-webkit-padding-after direction_aware, generated_api_class=WebkitPadding
 -webkit-logical-width direction_aware
 -webkit-logical-height direction_aware
 -webkit-min-logical-width direction_aware