Animate IOS Share extension button.

ios/chrome/share_extension/strings/ios_share_extension_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!--
 This file contains definition of resources that will be translated for each
 locale.  The variables is_win, is_macosx, is_linux, is_ios and is_posix are
 available for making strings OS specific.  Other platform defines such as
 use_titlecase are declared in build/common.gypi.
 
 The strings in this file are specific to iOS, thus is_ios will be true and
 all other OS specific variables will be false.
@@ skipping 118 matching lines @@
     <file path="resources/ios_share_extension_strings_zh-TW.xtb" lang="zh-TW" />
   </translations>
   <release seq="1" allow_pseudo="false">
     <messages fallback_to_english="true">
       <message name="IDS_IOS_ADD_READING_LIST_SHARE_EXTENSION" desc="Share extension button to add to reading list [Length: 30em]" meaning="Button title [Length: 30em]">
         Read Later
       </message>
       <message name="IDS_IOS_ADD_BOOKMARKS_SHARE_EXTENSION" desc="Share extension button to add to bookmarks [Length: 30em]" meaning="Button title [Length: 30em]">
         Add to Bookmarks 
       </message>
+      <message name="IDS_IOS_ADDED_ITEM_SHARE_EXTENSION" desc="Label of the button 'add to' after it has been pressed confirming the action to the user.">
+        Added
+      </message>
       <message name="IDS_IOS_ERROR_MESSAGE_SHARE_EXTENSION" desc="Share extension message to tell the user the URL cannot be processed. The name of the application will be put in place of APPLICATION_NAME">
         APPLICATION_NAME cannot handle this link.
       </message>
       <message name="IDS_IOS_OK_BUTTON_SHARE_EXTENSION" desc="Label for the OK button in the share extension.">
         OK
       </message>
     </messages>
   </release>
 </grit>