DevTools: [Documentation] Add syntax highlight for code examples

Source/devtools/front_end/ui/DOMSyntaxHighlighter.js

 /*
  * Copyright (C) 2010 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 79 matching lines @@
             tokenize(line, processToken.bind(this));
             if (plainTextStart < line.length) {
                 var plainText = line.substring(plainTextStart, line.length);
                 node.appendChild(document.createTextNode(plainText));
             }
             if (i < lines.length - 1)
                 node.appendChild(document.createElement("br"));
         }
     }
 }