[runmode] Pass the mode object to the callback

Without the mode object, it's not possible to call the mode's `indent` method to compute how much a given line should be indented (which we now have a need to do in a standalone way).

Author: mtaran-google

addon/runmode/runmode.js

@@ -67,7 +67,7 @@ CodeMirror.runMode = function(string, modespec, callback, options) {
     if (!stream.string && mode.blankLine) mode.blankLine(state);
     while (!stream.eol()) {
       var style = mode.token(stream, state);
-      callback(stream.current(), style, i, stream.start, state);
+      callback(stream.current(), style, i, stream.start, state, mode);
       stream.start = stream.pos;
     }
   }