[Mac] Add system share menu

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 9946 matching lines @@
         </message>
         <message name="IDS_CLOSE_TAB_MAC" desc="The Mac menu item to close a browser tab in the file menu.">
           Close Tab
         </message>
         <message name="IDS_SAVE_PAGE_MAC" desc="The Mac menu item to save a page in the file menu.">
           Save Page As...
         </message>
         <message name="IDS_EMAIL_PAGE_LOCATION_MAC" desc="The Mac menu item to email the page location in the file menu.">
           Email Page Location
         </message>
+        <message name="IDS_SHARING_MORE_MAC" desc="The Mac menu item to see more macOS share extensions in the share menu.">
+          More...
+        </message>
+        <message name="IDS_SHARE_MAC" desc="The Mac menu item for sharing to external services.">
+          Share
+        </message>
         <message name="IDS_PRINT_USING_SYSTEM_DIALOG_MAC" desc="The Mac menu item to print using system dialog in the file menu">
           Print Using System Dialog...
         </message>
         <!-- Edit menu -->
         <message name="IDS_EDIT_UNDO_MAC" desc="The Mac menu item undo in the edit menu.">
           Undo
         </message>
         <message name="IDS_EDIT_REDO_MAC" desc="The Mac menu item redo in the edit menu.">
           Redo
         </message>
@@ skipping 2387 matching lines @@
 
     <!-- VR specific strings -->
     <if expr="enable_vr">
       <message name="IDS_PRESS_APP_TO_EXIT" desc="Text displayed in a transient bubble to tell users how to return from cinema mode (where the page displayed in a cinema like environment) or presentation mode (where the WebVR page occupies the entire screen) to normal mode.">
         Press App button to exit
       </message>
     </if>
   </messages>
  </release>
 </grit>