DevTools: [Styles] Add all known unicode-bidi values to CSSMetadata

Source/devtools/front_end/CSSMetadata.js

 /*
  * Copyright (C) 2010 Nikita Vasilyev. All rights reserved.
  * Copyright (C) 2010 Joseph Pecoraro. All rights reserved.
  * 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
@@ skipping 414 matching lines @@
     "font-family": { values: [
         "serif", "sans-serif", "cursive", "fantasy", "monospace", "-webkit-body", "-webkit-pictograph"
     ] },
     "text-overflow-mode": { values: [
         "clip", "ellipsis"
     ] },
     "border-bottom-style": { values: [
         "none", "hidden", "inset", "groove", "ridge", "outset", "dotted", "dashed", "solid", "double"
     ] },
     "unicode-bidi": { values: [
-        "normal", "bidi-override", "embed"
+        "normal", "bidi-override", "embed", "isolate", "isolate-override", "plaintext"
     ] },
     "clip-rule": { values: [
         "nonzero", "evenodd"
     ] },
     "margin-left": { values: [
         "auto"
     ] },
     "margin-top": { values: [
         "auto"
     ] },
@@ skipping 545 matching lines @@
 
     /**
      * @param {string} longhand
      * @return {?Array.<string>}
      */
     shorthands: function(longhand)
     {
         return this._shorthands[longhand];
     }
 }