Added CSSPropertyAPIMethods.json5 which defines all API methods.

third_party/WebKit/Source/build/scripts/scripts.gni

Index: third_party/WebKit/Source/build/scripts/scripts.gni
diff --git a/third_party/WebKit/Source/build/scripts/scripts.gni b/third_party/WebKit/Source/build/scripts/scripts.gni
index 4b35a41e182761e0229af02317825320d3f60f88..65820846c9529d9830e30e202b5bb204ecfed9b4 100644
--- a/third_party/WebKit/Source/build/scripts/scripts.gni
+++ b/third_party/WebKit/Source/build/scripts/scripts.gni
@@ -26,6 +26,11 @@ scripts_for_in_files = [
 css_properties_files =
     scripts_for_in_files + [ "$_scripts_dir/css_properties.py" ]
 
+make_css_property_api_files = [

[sashab, 2017/02/10 05:47:17]

Not needed :)

+  "$_scripts_dir/templates/CSSPropertyAPIFiles.h.tmpl",
+  "$_scripts_dir/templates/CSSPropertyDescriptor.cpp.tmpl",
+]
+
 make_event_factory_files = scripts_for_in_files + [
                              "$_scripts_dir/make_event_factory.py",
                              "$_scripts_dir/templates/EventFactory.cpp.tmpl",
@@ -137,6 +142,9 @@ template("css_properties") {
   process_in_files(target_name) {
     script = invoker.script
     in_files = [ "css/CSSProperties.json5" ]
+    if (defined(invoker.in_files)) {

[sashab, 2017/02/10 05:47:17]

Might not need this if we do += below :)

+      in_files += invoker.in_files
+    }
     other_inputs = css_properties_files
     if (defined(invoker.other_inputs)) {
       other_inputs += invoker.other_inputs