Added CSSPropertyAPIMethods.json5 which defines all API methods.

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 #include "core/css/properties/CSSPropertyDescriptor.h"
 
 {% for api_class in api_classes %}
 #include "core/css/properties/{{api_class.classname}}.h"
 {% endfor %}
 
 namespace blink {
 
 static_assert(
     std::is_pod<CSSPropertyDescriptor>::value,
     "CSSPropertyDescriptor must be a POD to support using initializer lists.");
 
 static CSSPropertyDescriptor cssPropertyDescriptors[] = {
     // An invalid CSSPropertyDescriptor.
     {
-      {% for valid_api_method in valid_api_methods %}
+      {% for api_methods in all_api_method_names %}
         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 all_api_method_names %}
+      {% if api_method_name in api_class.methods_for_class %}
+      {{api_class.classname}}::{{api_method_name}},
       {% else %}
       nullptr,
+      {% endif %}
       {% endfor %}
     },
     {% endfor %}
 };
 
 const CSSPropertyDescriptor& CSSPropertyDescriptor::get(CSSPropertyID id) {
   // TODO(aazzam): We are currently using hard-coded indexes for
   // cssPropertyDescriptor since we have only implemented a few properties.
   // Later, generate this switch statement, or alternatively return
   // cssPropertyDescriptors[id], and generate the cssPropertyDescriptors array
   // to hold invalid descriptors for methods which haven't been implemented yet.
   switch (id) {
   {% for api_class in api_classes %}
     {% for property_id in api_class.property_ids %}
     case {{property_id}}:
     {% endfor %}
       return cssPropertyDescriptors[{{api_class.index}}];
   {% endfor %}
     default:
       return cssPropertyDescriptors[0];
   }
 }
 
 }  // namespace blink