Add sync settings for reading list

components/sync_ui_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <grit-part>
   <if expr="not is_android">
     <message name="IDS_SYNC_BASIC_ENCRYPTION_DATA" desc="Text of the radio that when selected enables basic encryption.">
       Encrypt synced passwords with your Google credentials
     </message>
     <message name="IDS_SYNC_CONFIGURE_ENCRYPTION" desc="Link to configure sync encryption for passwords">
       Please update your sync passphrase.
     </message>
     <message name="IDS_SYNC_DATATYPE_AUTOFILL" desc="Form Autofill items, one of the data types that we allow syncing.">
       Autofill
     </message>
     <message name="IDS_SYNC_DATATYPE_BOOKMARKS" desc="Bookmarks, one of the data types that we allow syncing.">
       Bookmarks
     </message>
     <message name="IDS_SYNC_DATATYPE_PASSWORDS" desc="Saved passwords, one of the data types that we allow syncing.">
       Passwords
     </message>
     <message name="IDS_SYNC_DATATYPE_PREFERENCES" desc="Settings, one of the data types that we allow syncing.">
       Settings
     </message>
     <message name="IDS_SYNC_DATATYPE_TABS" desc="Open Tabs, one of the data types that we allow syncing.">
       Open tabs
     </message>
     <message name="IDS_SYNC_DATATYPE_TYPED_URLS" desc="History, one of the data types that we allow syncing.">
       History
     </message>
+    <message name="IDS_SYNC_DATATYPE_READING_LIST" desc="Reading List, one of the data types that we allow syncing">

[Olivier, 2016/11/30 14:10:26]

Is this used somewhere?

[gambard, 2016/11/30 14:31:44]

It is used in the UI, downstream.

+      Reading List
+    </message>
     <message name="IDS_SYNC_EMPTY_PASSPHRASE_ERROR" desc="Error message when the passphrase is empty.">
       Empty passphrase is not allowed.
     </message>
     <message name="IDS_SYNC_ENCRYPTION_SECTION_TITLE" desc="Title of the section containing sync encryption preferences.">
       Encryption options
     </message>
     <message name="IDS_SYNC_ENTER_GOOGLE_PASSPHRASE_BODY" desc="Instructions for the dialog where the user needs to enter their previous google passphrase.">
       You already have data that is encrypted using a different version of your Google Account password. Please enter it below.
     </message>
     <message name="IDS_SYNC_FULL_ENCRYPTION_DATA" desc="Text of the radio that when selected enables full encryption.">
@@ skipping 12 matching lines @@
       Sync is not available for your domain
     </message>
   </if>
   <message name="IDS_SYNC_ENTER_PASSPHRASE_BODY_WITH_DATE" desc="Instructions for the dialog where the user enters the passphrase.">
     Your data was encrypted with your sync passphrase on <ph name="TIME">$1<ex>Sept 1, 2012</ex></ph>. Enter it to start sync.
   </message>
   <message name="IDS_SYNC_ENTER_PASSPHRASE_BODY" desc="Instructions for the dialog where the user enters the passphrase.">
     Your data is encrypted with your sync passphrase. Enter it to start sync.
   </message>
 </grit-part>