cocoa: add some tab-manipulation menu items

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 2133d70c05d1053b382c8aadae702281e4dcf936..a891afd115c3a1279a98d5e07ab9690bbe475669 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -10071,6 +10071,15 @@ Tell us what happened exactly before you got the profile error 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...