Added CSSPropertyAPIMethods.json5 which defines all API methods.

third_party/WebKit/Source/build/scripts/templates/CSSPropertyDescriptor.cpp.tmpl

Index: third_party/WebKit/Source/build/scripts/templates/CSSPropertyDescriptor.cpp.tmpl
diff --git a/third_party/WebKit/Source/build/scripts/templates/CSSPropertyDescriptor.cpp.tmpl b/third_party/WebKit/Source/build/scripts/templates/CSSPropertyDescriptor.cpp.tmpl
index 0cc67d6d5b89221417b0503fc38658112617126a..2798248fc508f7e0d9778c2951ed48b24a1d864a 100644
--- a/third_party/WebKit/Source/build/scripts/templates/CSSPropertyDescriptor.cpp.tmpl
+++ b/third_party/WebKit/Source/build/scripts/templates/CSSPropertyDescriptor.cpp.tmpl
@@ -16,17 +16,19 @@ static_assert(
 static CSSPropertyDescriptor cssPropertyDescriptors[] = {
     // An invalid CSSPropertyDescriptor.
     {
-      {% for valid_api_method in valid_api_methods %}
+      {% for api_methods in ordered_api_method_names %}

[sashab, 2017/02/10 00:58:33]

api_methods -> api_method

         nullptr,
       {% endfor %}
     },
     // CSSPropertyDescriptors for all valid properties.
     {% for api_class in api_classes %}
     {
-      {% for api_method in api_methods if api_method in api_class.api_methods %}
-      {{api_class.classname}}::{{api_method}},
+      {% for api_method_name in ordered_api_method_names %}
+      {% if api_method_name in api_class.methods_for_class %}
+      {{api_class.classname}}::{{api_method_name}},
       {% else %}
       nullptr,
+      {% endif %}
       {% endfor %}
     },
     {% endfor %}