Merge .in files for css/svg properties into a single file

Source/build/scripts/scripts.gni

Index: Source/build/scripts/scripts.gni
diff --git a/Source/build/scripts/scripts.gni b/Source/build/scripts/scripts.gni
index ab0e1dedbaac4673fe538726583722fb4042ba46..ce4d65b207b1b88ebcad0e53593e9aedecbd44a9 100644
--- a/Source/build/scripts/scripts.gni
+++ b/Source/build/scripts/scripts.gni
@@ -116,12 +116,24 @@ template("process_in_files") {
 
 # Template to run the make_names script. This is a special case of
 # process_in_files.
-#   in_files: files to pass to the script
 #   outputs: expected results
-template("make_names") {
+template("css_properties") {
   process_in_files(target_name) {
     script = "//third_party/WebKit/Source/build/scripts/make_names.py"
     in_files = invoker.in_files
+    other_inputs = invoker.other_inputs
+    outputs = invoker.outputs
+  }
+}
+
+# Template to run the make_names script. This is a special case of
+# process_in_files.
+#   in_files: files to pass to the script
+#   outputs: expected results
+template("make_names") {
+  process_in_files(target_name) {
+    script = invoker.script
+    in_files = ["CSSProperties.in"]
     other_inputs = make_names_files
     outputs = invoker.outputs
     other_args = [ "--defines", feature_defines_string ]