cocoa: add some tab-manipulation menu items

chrome/app/generated_resources.grd

 <?xml version="1.0" encoding="utf-8"?>
 
 <!--
 This file contains definitions of resources that will be translated for each
 locale.  The variables is_win, is_macosx, is_linux, and is_posix are available
 for making strings OS specific.  Other platform defines such as use_titlecase
 are declared in build/common.gypi.
 -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
@@ skipping 10053 matching lines @@
         </message>
         <message name="IDS_WINDOW_AUDIO_MUTING_MAC" desc="The emoji to append to the title of a window showing audio is muting.">
           <ph name="TAB_TITLE">$1<ex>The Title of the Tab</ex></ph> <ph name="EMOJI_MUTING">$2<ex>(muting)</ex></ph>
         </message>
         <message name="IDS_SHOW_EXTENSIONS_MAC" desc="The Mac menu item to show extensions in the window menu.">
           Extensions
         </message>
         <message name="IDS_ALL_WINDOWS_FRONT_MAC" desc="The Mac menu item for bring all to front the window menu.">
           Bring All to Front
         </message>
+        <message name="IDS_DUPLICATE_TAB_MAC" desc="The Mac menu item for duplicating the selected tab(s).">
+          Duplicate Tab
+        </message>
+        <message name="IDS_MUTE_TAB_MAC" desc="The Mac menu item for muting the selected tab(s).">
+          Mute Tab
+        </message>
+        <message name="IDS_PIN_TAB_MAC" desc="The Mac menu item for pinning the selected tab(s).">
+          Pin Tab
+        </message>
         <!-- Help menu -->
         <message name="IDS_FEEDBACK_MAC" desc="The Mac menu item to report a bug in the Help menu.">
           Report an Issue...
         </message>
         <message name="IDS_HELP_MAC" desc="The Mac menu item to show help in the Help menu.">
           <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> Help
         </message>
       </if> <!-- is_macosx -->
 
       <!-- Linux Global Menubar Menus -->
@@ skipping 2188 matching lines @@
       Your downloads appear here
     </message>
 
     <!-- Automation info bar -->
     <message name="IDS_CONTROLLED_BY_AUTOMATION" desc="Message shown when the browser session is being controlled by an automated test.">
       Chrome is being controlled by automated test software.
     </message>
   </messages>
  </release>
 </grit>