Add install warning for printerProvider permission

extensions/extensions_strings.grd

 <?xml version="1.0" encoding="utf-8"?>
 
 <!--
   Strings for the extensions module. Used mostly for low-level error messages.
   Where possible new strings should be kept in Chrome and the extensions module
   should return an error code, message flag, etc.
 -->
 
 <grit latest_public_release="0" current_release="1"
       source_lang_id="en" enc_check="möl">
@@ skipping 347 matching lines @@
       </message>
       <message name="IDS_DEVICE_UNKNOWN_VENDOR" desc="String used when no human-readable vendor name is available for a device.">
         Vendor <ph name="VENDOR_ID">$1<ex>0x1234</ex></ph>
       </message>
       <message name="IDS_EXTENSION_PROMPT_WARNING_NETWORKING_CONFIG" desc="Permission string for Networking Config API.">
         Configure network connections
       </message>
       <message name="IDS_EXTENSION_PROMPT_WARNING_NETWORKING_PRIVATE" desc="Permission string for Networking Private API.">
         Manage network connections
       </message>
+      <message name="IDS_EXTENSION_PROMPT_WARNING_PRINTER_PROVIDER" desc="Permission string for Printer Provider API.">
+        Add printing destinations and access any jobs you submit to them
+      </message>
       <message name="IDS_EXTENSION_PROMPT_WARNING_SERIAL" desc="Permission string for access to serial devices.">
         Access your serial devices
       </message>
       <message name="IDS_EXTENSION_PROMPT_WARNING_VPN" desc="Permission string for access to VPN API.">
         Access your network traffic
       </message>
       <message name="IDS_EXTENSION_PROMPT_WARNING_USB_DEVICE_PRODUCT_NAME_AND_VENDOR" desc="USB device name and vendor string, used in various permission messages for USB devices.">
         <ph name="PRODUCT_NAME">$1<ex>SoundKnob</ex></ph> from <ph name="VENDOR_NAME">$2<ex>Griffin Technology</ex></ph>
       </message>
       <message name="IDS_EXTENSION_PROMPT_WARNING_USB_DEVICE" desc="Permission string for access to a specific USB device.">
@@ skipping 90 matching lines @@
         </message>
       </if>
       <if expr="not is_win">
         <message name="IDS_EXTENSION_UNPACK_FAILED" desc="">
           Can not unpack extension.  To safely unpack an extension, there must be a path to your profile directory that does not contain a symlink.  No such path exists for your profile.
         </message>
       </if>
     </messages>
   </release>
 </grit>