Made a generator for .h files for implementations of CSSPropertyAPI.h

Renamed make_css_property_descriptor.py to make_css_property_api.py and
modified it so that it also generates API .h files. Added the template
file CSSPropertyAPI.h.tmpl.

To generate the .h file for a property, add the api_class flag to the
property in CSSProperties.in.

BUG=668012

Review-Url: https://codereview.chromium.org/2578773002
Cr-Commit-Position: refs/heads/master@{#439053}

third_party/WebKit/Source/build/scripts/make_css_property_descriptor.py → third_party/WebKit/Source/build/scripts/make_css_property_apis.py

@@ -37,6 +37,7 @@ class CSSPropertyAPIWriter(make_style_builder.StyleBuilderWriter):
                 continue
             classname = get_classname(property)
             properties_for_class[classname].append(property['property_id'])
+            self._outputs[classname + '.h'] = self.generate_property_api_h_builder(classname)
 
         # Stores a list of classes with elements (index, classname, [propertyIDs, ..]).
         self._api_classes = []
@@ -55,5 +56,15 @@ class CSSPropertyAPIWriter(make_style_builder.StyleBuilderWriter):
             'api_classes': self._api_classes,
         }
 
+    # Provides a function object given the classname of the property.
+    # This returned function generates a .h file for the specified property.
+    def generate_property_api_h_builder(self, api_classname):
+        @template_expander.use_jinja('CSSPropertyAPIFiles.h.tmpl')
+        def generate_property_api_h():
+            return {
+                'api_classname': api_classname,
+            }
+        return generate_property_api_h
+
 if __name__ == '__main__':
     in_generator.Maker(CSSPropertyAPIWriter).main(sys.argv)

third_party/WebKit/Source/core/css/properties/CSSPropertyAPIWebkitPadding.h → third_party/WebKit/Source/build/scripts/templates/CSSPropertyAPIFiles.h.tmpl

@@ -2,20 +2,18 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CSSPropertyAPIWebkitPadding_h
-#define CSSPropertyAPIWebkitPadding_h
+#ifndef {{api_classname}}_h
+#define {{api_classname}}_h
 
 #include "core/CSSPropertyNames.h"
 #include "core/css/properties/CSSPropertyAPI.h"
 
 namespace blink {
 
-// TODO(aazzam): Generate API .h files
-
 class CSSParserTokenRange;
 class CSSParserContext;
 
-class CSSPropertyAPIWebkitPadding : public CSSPropertyAPI {
+class {{api_classname}} : public CSSPropertyAPI {
  public:
   static const CSSValue* parseSingleValue(CSSParserTokenRange&,
                                           const CSSParserContext&);
@@ -23,4 +21,4 @@ class CSSPropertyAPIWebkitPadding : public CSSPropertyAPI {
 
 }  // namespace blink
 
-#endif  // CSSPropertyAPIWebkitPadding_h
+#endif  // {{api_classname}}_h

third_party/WebKit/Source/core/BUILD.gn

@@ -424,9 +424,12 @@ css_properties("make_core_generated_computed_style_base") {
   ]
 }
 
-css_properties("make_core_generated_css_property_descriptor") {
-  script = "../build/scripts/make_css_property_descriptor.py"
-  other_inputs = [ "../build/scripts/templates/CSSPropertyDescriptor.cpp.tmpl" ]
+css_properties("make_core_generated_css_property_apis") {
+  script = "../build/scripts/make_css_property_apis.py"
+  other_inputs = [
+    "../build/scripts/templates/CSSPropertyDescriptor.cpp.tmpl",
+    "../build/scripts/templates/CSSPropertyAPIFiles.h.tmpl",
+  ]
   outputs = [
     "$blink_core_output_dir/css/properties/CSSPropertyDescriptor.cpp",
   ]
@@ -873,7 +876,7 @@ targets_generating_sources = [
   ":make_core_generated_css_primitive_value_unit_trie",
   ":make_core_generated_css_property_metadata",
   ":make_core_generated_computed_style_base",
-  ":make_core_generated_css_property_descriptor",
+  ":make_core_generated_css_property_apis",
   ":make_core_generated_css_property_names",
   ":make_core_generated_cssom_types",
   ":make_core_generated_event_factory",

third_party/WebKit/Source/core/css/BUILD.gn

@@ -346,7 +346,6 @@ blink_core_sources("css") {
     "parser/SizesCalcParser.cpp",
     "properties/CSSPropertyAPI.h",
     "properties/CSSPropertyAPIWebkitPadding.cpp",
-    "properties/CSSPropertyAPIWebkitPadding.h",
     "properties/CSSPropertyDescriptor.h",
     "resolver/AnimatedStyleBuilder.cpp",
     "resolver/AnimatedStyleBuilder.h",