[fsp] Add notifications in case of slow operations.

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 75d60714a5f35bf130a29e7c29078544ec576bb1..2105055535febce8752e299d60697c5ea6ead8f2 100644
--- a/chrome/app/chromeos_strings.grdp
+++ b/chrome/app/chromeos_strings.grdp
@@ -138,6 +138,15 @@ Press any key to continue exploring.
   <message name="IDS_FLAGS_FILE_MANAGER_ENABLE_NEW_GALLERY_DESCRIPTION" desc="Description of the about:flag option to the enable new gallery app.">
     Use the experimental new gallery instead of the stable one.
   </message>
+  <message name="IDS_FILE_SYSTEM_PROVIDER_UNRESPONSIVE_WARNING" desc="A warning shown in a notification that an operation is taking longer than expected.">
+    An operation is taking longer than expected. Do you want to abort it?
+  </message>
+  <message name="IDS_FILE_SYSTEM_PROVIDER_MANY_UNRESPONSIVE_WARNING" desc="A warning shown in a notification that more than one operations are taking longer than expected.">
+    Some operations are taking longer than expected. Do you want to abort them?
+  </message>
+  <message name="IDS_FILE_SYSTEM_PROVIDER_UNRESPONSIVE_ABORT_BUTTON" desc="Label of the button on the notification about an operation(s) taking to long.">
+    Abort
+  </message>
   <message name="IDS_FILE_BROWSER_ARCHIVE_DIRECTORY_LABEL" desc="/archive directory label.">
     Archives
   </message>