Add strings and notifier ID for low disk.

chrome/app/chromeos_strings.grdp

Index: chrome/app/chromeos_strings.grdp
diff --git a/chrome/app/chromeos_strings.grdp b/chrome/app/chromeos_strings.grdp
index 7c3b2564914f4fcc5b0554cf45fb3b9fdfd76955..687b01a08814a8bc29815f23f4bb54e31be0ba13 100644
--- a/chrome/app/chromeos_strings.grdp
+++ b/chrome/app/chromeos_strings.grdp
@@ -6728,4 +6728,19 @@ All users must sign out to continue.
   <message name="IDS_FLAGS_ENABLE_IME_MENU_DESCRIPTION" desc="Description of the about: flag for enabling opt-in IME menu.">
     Enable access to the new IME menu in the Language Settings page.
   </message>
+  <message name="IDS_LOW_DISK_NOTIFICATION_TITLE" desc="Title of the notification warning users that they are low on disk space.">
+    Device is low on space

[Mr4D (OOO till 08-26), 2016/06/24 01:36:21]

disc space?

[dspaid, 2016/06/24 02:32:41]

Done.

+  </message>
+  <message name="IDS_LOW_DISK_NOTIFICATION_MESSAGE" desc="Notification text warning users that they are low on disk space.">
+    Free up space or select data may be automatically deleted

[Mr4D (OOO till 08-26), 2016/06/24 01:36:21]

disc space?

[dspaid, 2016/06/24 02:32:41]

Done.

+  </message>
+  <message name="IDS_CRITICALLY_LOW_DISK_NOTIFICATION_TITLE" desc="Title of the notification warning users that they are critically low on disk space.">
+    Device space critically low

[Mr4D (OOO till 08-26), 2016/06/24 01:36:21]

..

[dspaid, 2016/06/24 02:32:41]

Done.

+  </message>
+  <message name="IDS_CRITICALLY_LOW_DISK_NOTIFICATION_MESSAGE" desc="Notification text warning users that they are critically low on disk space.">
+    Free up space or device will become unresponsive.
+  </message>
+  <message name="IDS_LOW_DISK_NOTIFICATION_BUTTON" desc="Button on the low disk notification to open storage management.">
+    Manage storage
+  </message>
 </grit-part>