Added support for Text only zoom...

chrome/common/page_zoom.h

-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_COMMON_PAGE_ZOOM_H_
 #define CHROME_COMMON_PAGE_ZOOM_H_
 
+#include "base/basictypes.h"
+
 // This enum is the parameter to various text/page zoom commands so we know
 // what the specific zoom command is.
 class PageZoom {
  public:
   enum Function {
-    SMALLER  = -1,
-    STANDARD = 0,
-    LARGER   = 1,
+    TEXT_ONLY_SMALLER  = -2,
+    SMALLER            = -1,
+    STANDARD           = 0,
+    LARGER             = 1,
+    TEXT_ONLY_LARGER   = 2,
   };
 
  private:
-  PageZoom() {}  // For scoping only.
+  DISALLOW_IMPLICIT_CONSTRUCTORS(PageZoom);
 };
 
 #endif  // CHROME_COMMON_PAGE_ZOOM_H_