Add code to prompt for browser login during app notification setup

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index bc3db1eba680abd23ee7499cb1150c5c3d84bd9b..0ecec2564a36c8ea05cd7d405c0fff21c7615c77 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -8939,6 +8939,17 @@ Keep your key file in a safe place. You will need it to create new versions of y
         </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">