chromeos: Refactor the code for showing the network UI.

ui/chromeos/ui_chromeos_strings.grd

Index: ui/chromeos/ui_chromeos_strings.grd
diff --git a/ui/chromeos/ui_chromeos_strings.grd b/ui/chromeos/ui_chromeos_strings.grd
index a5004a11c025364251b45c06e93f7c424f1d1c3e..7b82c625618fcd16752f55a179dfd80a9b842802 100644
--- a/ui/chromeos/ui_chromeos_strings.grd
+++ b/ui/chromeos/ui_chromeos_strings.grd
@@ -131,6 +131,28 @@
         No network
       </message>
 
+      <message name="IDS_ASH_STATUS_TRAY_NETWORK_NO_VPN" desc="The label used in the tray popup to notify no vpn is configured.">
+        VPN is not configured.
+      </message>
+      <message name="IDS_ASH_STATUS_TRAY_NO_NETWORKS" desc="The message to display in the network info bubble when it is otherwise empty.">
+        No network information available
+      </message>
+      <message name="IDS_ASH_STATUS_TRAY_NO_CELLULAR_NETWORKS" desc="The message to display in the network list when no cellular networks are available.">
+        No cellular network available
+      </message>
+      <message name="IDS_ASH_STATUS_TRAY_VPN_DISCONNECTED" desc="The label used in system tray bubble to display vpn is disconnected.">
+        VPN disconnected
+      </message>
+      <message name="IDS_ASH_STATUS_TRAY_NETWORK_WIFI_ENABLED" desc="The label used in the tray popup to notify that Wi-Fi is turned on.">
+        Wi-Fi is turned on.
+      </message>
+      <message name="IDS_ASH_STATUS_TRAY_NETWORK_WIFI_DISABLED" desc="The label used in the tray popup to notify that Wi-Fi is turned off.">
+        Wi-Fi is turned off.
+      </message>
+      <message name="IDS_ASH_STATUS_TRAY_WIFI_SCANNING_MESSAGE" desc="Scanning for wifi networks">
+        Searching for Wi-Fi networks...
+      </message>
+
       <!-- Default user profile images. -->
       <!-- User Image default image accessible descriptions -->
       <message name="IDS_LOGIN_DEFAULT_USER_DESC_19" desc="Description of the default user icon with a picture of a bicycle">