Added property id comments to CSSDescriptorIndices entries.

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

+{% from 'macros.tmpl' import license, print_if %}
 // 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 {
@@ skipping 27 matching lines @@
 };
 
 {% for api_method_name in ordered_api_method_names %}
 static_assert(cssPropertyDescriptors[INVALID_DESCRIPTOR_INDEX].{{api_method_name}} == nullptr, 
               "Invalid CSSPropertyDescriptor contains non-nullptr member");
 {% endfor %}
 
 // Lookup table mapping CSSPropertyID to index in the cssPropertyDescriptors
 // table
 static size_t CSSDescriptorIndices[] = {
-   {% for id in descriptor_indices %}
-   {{id}},
+   {% for item in descriptor_indices %}
+   {{descriptor_indices[item].id}},{{print_if(descriptor_indices[item].api != None, ' // ' ~ descriptor_indices[item].api)}}
    {% endfor %}
 };
 
 const CSSPropertyDescriptor& CSSPropertyDescriptor::Get(CSSPropertyID id) {
       return cssPropertyDescriptors[CSSDescriptorIndices[id]];
 }
 
 }  // namespace blink