Added CSSPropertyAPI.h.tmpl to generate CSSPropertyAPI.h.

third_party/WebKit/Source/core/css/properties/CSSPropertyAPIMethods.json5

 {
         // This file specifies all the methods in CSSPropertyAPI.h and the necessary
         // information for code generation of the API and it's related classes.
         parameters: {
                 // - name
                 // The name of this method in camel case.
                 name: {
                         default: "",
                         valid_type: "str",
                 },
 
                 // - return_type
                 // Return type of this method.
                 return_type: {
                         default: "",
                         valid_type: "str",
                 },
 
                 // - parameters
                 // The parameters of this method. This string should be the types of
                 // all parameters, inside brackets and comma separated.
                 parameters: {
                         default: "",
                         valid_type: "str",
-                }
+                },
+
+                // - comment
+                // A string comment describing the API method. This comment will be
+                // placed in the code above the method definition in CSSPropertyAPI.h.
+                // This comment should be defined as a list of strings, each no longer than
+                // 72 chars.
+                comment: {

[sashab, 2017/02/10 02:47:09]

Rename to 'description'

+                        default: [],
+                        valid_type: "list",
+                },
         },
         data: [
                 {
                   name: "parseSingleValue",
                   return_type: "const CSSValue*",
-                  parameters: "(CSSParserTokenRange&, const CSSParserContext*)"
+                  parameters: "(CSSParserTokenRange&, const CSSParserContext*)",
+                  comment: ["Parses a single CSS property and returns the corresponding CSSValue. If the", " input is invalid it returns nullptr."],

[sashab, 2017/02/10 02:47:09]

Change comment to single string

                 },
                 {
                   name: "parseShorthand",
                   return_type: "bool",
-                  parameters: "(bool, CSSParserTokenRange&, const CSSParserContext*)"
+                  parameters: "(bool, CSSParserTokenRange&, const CSSParserContext*)",
+                  comment: ["Returns true if the property can be parsed as a shorthand."],
                 },
         ]
 }