Added resources for in-session captive portal notification.

chrome/app/theme/theme_resources.grd

Index: chrome/app/theme/theme_resources.grd
diff --git a/chrome/app/theme/theme_resources.grd b/chrome/app/theme/theme_resources.grd
index dcbebfaeb6791eff809065bb604f47120fee72d2..122b20d68856583b954447f85cee0780583cf0f0 100644
--- a/chrome/app/theme/theme_resources.grd
+++ b/chrome/app/theme/theme_resources.grd
@@ -501,6 +501,10 @@
       <if expr="pp_ifdef('chromeos')">
         <structure type="chrome_scaled_image" name="IDR_NOTIFICATION_PERIPHERAL_BATTERY_LOW" file="cros/notification_peripheral_battery_low.png" />
       </if>
+      <if expr="pp_ifdef('chromeos')">
+        <structure type="chrome_scaled_image" name="IDR_PORTAL_DETECTION_ALERT" file="common/captive_portal_icon.png" />
+        <structure type="chrome_scaled_image" name="IDR_PORTAL_DETECTION_GLOBE" file="common/globe_icon.png" />

[oshima, 2014/02/19 18:43:55]

If they're cros only, the files should be under cros/. Are these file going to
be used by other platforms?

[ygorshenin1, 2014/02/20 13:33:42]

Done.

+      </if>
       <if expr="is_win or pp_ifdef('desktop_linux')">
         <structure type="chrome_scaled_image" name="IDR_NOTIFICATION_TRAY_DO_NOT_DISTURB_ATTENTION" file="common/notification_tray_do_not_disturb_attention.png" />
         <structure type="chrome_scaled_image" name="IDR_NOTIFICATION_TRAY_DO_NOT_DISTURB_EMPTY" file="common/notification_tray_do_not_disturb_empty.png" />