Output webidl filenames as they are processed, for real this time.

dom/bindings/GenerateCSS2PropertiesWebIDL.py

@@ -17,6 +17,7 @@ def generateLine(propName, extendedAttrs):
                                                  propName)
 def generate(output, idlFilename, preprocessorHeader):
     print(idlFilename)
+    sys.stdout.flush()
     cpp = list(buildconfig.substs['CPP'])
     cpp += shellutil.split(buildconfig.substs['ACDEFINES'])
     cpp.append(preprocessorHeader)