Add code to prompt for browser login during app notification setup

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 8927 matching lines @@
       <message name="IDS_APP_CONTEXT_MENU_OPEN_FULLSCREEN"
                desc="Text for the button that opens the app full screen.">
         Open full screen
       </message>
       <if expr="pp_ifdef('chromeos')">
         <message name="IDS_NEW_TAB_CLOSE_MENU_EXPAND" desc="Text for the closed section menu footer that will restore the section.">
           Expand
         </message>
       </if>
 
+      <!-- App Notifications -->
+      <message name="IDS_APP_NOTIFICATION_NEED_SIGNIN" desc="Displayed when an app wants to send server push notifictions to Chrome, but the user isn't signed in to the browser (which is required for the feature to work).">
+        <ph name="APP_NAME">$1<ex>Google News</ex></ph> would like to send notifications, but you need to be signed in to Chrome.
+      </message>
+      <message name="IDS_APP_NOTIFICATION_NEED_SIGNIN_ACCEPT" desc="Text shown for the button that will take you to sign in to the browser.">
+        Sign in now
+      </message>
+      <message name="IDS_APP_NOTIFICATION_NEED_SIGNIN_CANCEL" desc="Text shown for the button to indicate the user is not interested in the feature.">
+        No thanks
+      </message>
+
       <!-- Offline page  -->
       <if expr="pp_ifdef('chromeos')">
         <message name="IDS_OFFLINE_LOAD_HEADLINE" desc="Offline Page HTML headline">
           Your device is offline
         </message>
         <message name="IDS_SITE_OFFLINE_LOAD_DESCRIPTION" desc="offline site">
           The webpage at <ph name="HOST_NAME">&lt;strong&gt;$1<ex>www.offline.com</ex>&lt;/strong&gt;</ph> cannot be reached because your network connection is down. The page will be loaded when the network connection is restored. <ph name="LINE_BREAK">&lt;br&gt;<ex>&lt;br&gt;</ex></ph>
         </message>
         <message name="IDS_APP_OFFLINE_LOAD_DESCRIPTION" desc="offline app">
           The app at <ph name="HOST_NAME">&lt;strong&gt;$1<ex>www.offline.com</ex>&lt;/strong&gt;</ph> cannot be reached because your network connection is down. The page will be loaded when the network connection is restored. <ph name="LINE_BREAK">&lt;br&gt;<ex>&lt;br&gt;</ex></ph>
@@ skipping 5580 matching lines @@
     </messages>
     <structures fallback_to_english="true">
       <!-- Make sure these stay in sync with the structures in generated_resources.grd. -->
       <structure name="IDD_CHROME_FRAME_FIND_DIALOG" file="cf_resources.rc" type="dialog" >
       </structure>
       <structure name="IDD_CHROME_FRAME_READY_PROMPT" file="cf_resources.rc" type="dialog" >
       </structure>
     </structures>
   </release>
 </grit>