Add Ash notification UI for OutOfCredits network property

ash/ash_chromeos_strings.grdp

Index: ash/ash_chromeos_strings.grdp
diff --git a/ash/ash_chromeos_strings.grdp b/ash/ash_chromeos_strings.grdp
index 221d0c2b9e6d9e55db13237418ed0aba3b4fd923..a26d7d33f63d9b12ec6218cda35cb2a29cbbd9c1 100644
--- a/ash/ash_chromeos_strings.grdp
+++ b/ash/ash_chromeos_strings.grdp
@@ -117,6 +117,15 @@
   <message name="IDS_NETWORK_CONNECTION_ERROR_MESSAGE_WITH_DETAILS" desc="Message for network connection error notification with details">
     Failed to connect to network '<ph name="name">$1<ex>GoogleGuest</ex></ph>': <ph name="details">$2<ex>Unrecognized error</ex></ph>
   </message>
+  <message name="IDS_NETWORK_OUT_OF_CREDITS_TITLE" desc="Title for network out of data error notification">
+    Network Connection Error
+  </message>
+  <message name="IDS_NETWORK_OUT_OF_CREDITS_BODY" desc="Message body for network out of data error notification">
+    You may have used up your mobile data allowance.
+  </message>
+  <message name="IDS_NETWORK_OUT_OF_CREDITS_LINK" desc="Link text for network out of data error notification">
+    Visit the <ph name="name">$1<ex>GoogleGuest</ex></ph> activation portal to buy more data.
+  </message>
 
   <!-- Network state strings -->
   <message name="IDS_CHROMEOS_NETWORK_STATE_UNKNOWN" desc="Network state in about:network: UNKNOWN">