Convert Settings.in, CSSValueKeywords.in, SVGCSSValueKeywords.in to json5

third_party/WebKit/Source/devtools/BUILD.gn

Index: third_party/WebKit/Source/devtools/BUILD.gn
diff --git a/third_party/WebKit/Source/devtools/BUILD.gn b/third_party/WebKit/Source/devtools/BUILD.gn
index 93fb9a85ffc91b91bf887dd81fa79a2ca91edc2a..5520423b875a83444cb15a5a1a08919931f34fed 100644
--- a/third_party/WebKit/Source/devtools/BUILD.gn
+++ b/third_party/WebKit/Source/devtools/BUILD.gn
@@ -945,17 +945,16 @@ action("devtools_extension_api") {
 
 action("supported_css_properties") {
   script = "scripts/build/generate_supported_css.py"
+  helper_scripts = [ "scripts/build/json5_generator.py" ]
 
-  inputs = [
-    "../core/css/CSSProperties.in",
-  ]
+  inputs = helper_scripts + [ "../core/css/CSSProperties.json5" ]
 
   outputs = [
     "$resources_out_dir/SupportedCSSProperties.js",
   ]
 
-  args =
-      rebase_path(inputs, root_build_dir) + rebase_path(outputs, root_build_dir)
+  args = rebase_path([ "../core/css/CSSProperties.json5" ], root_build_dir) +
+         rebase_path(outputs, root_build_dir)
 }
 
 action("frontend_protocol_sources") {