DevTools: [CodeMirror] Add syntax highlighting for some other languages.

Source/devtools/front_end/UISourceCode.js

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 515 matching lines @@
     {
         delete this._workingCopy;
         delete this._workingCopyGetter;
     },
 
     /**
      * @param {string} newWorkingCopy
      */
     setWorkingCopy: function(newWorkingCopy)
     {
-        this._mimeType = this.canonicalMimeType();
+        if (!this._mimeType)
+            this._mimeType = this.canonicalMimeType();
         this._workingCopy = newWorkingCopy;
         delete this._workingCopyGetter;
         this.dispatchEventToListeners(WebInspector.UISourceCode.Events.WorkingCopyChanged);
     },
 
     setWorkingCopyGetter: function(workingCopyGetter)
     {
         this._workingCopyGetter = workingCopyGetter;
         this.dispatchEventToListeners(WebInspector.UISourceCode.Events.WorkingCopyChanged);
     },
@@ skipping 530 matching lines @@
         function persist()
         {
             window.localStorage[key] = this._content;
             window.localStorage["revision-history"] = JSON.stringify(registry);
         }
 
         // Schedule async storage.
         setTimeout(persist.bind(this), 0);
     }
 }