Fix issue #6266651: Low storage warning takes long time to sort apps by usage

On a device with emulated external storage, the low storage notification
should go to the main storage settings UI.  This shows the user all of
the things that could be causing their storage to be low.

Change-Id: I9c345b6cb7abbabc24a67c7e104d077ecbbfb86d

Author: Dianne Hackborn

services/java/com/android/server/DeviceStorageMonitorService.java

@@ -25,6 +25,7 @@
 import android.content.pm.IPackageDataObserver;
 import android.content.pm.IPackageManager;
 import android.os.Binder;
+import android.os.Environment;
 import android.os.Handler;
 import android.os.Message;
 import android.os.Process;
@@ -336,7 +337,9 @@ private final void sendNotification() {
         //log the event to event log with the amount of free storage(in bytes) left on the device
         EventLog.writeEvent(EventLogTags.LOW_STORAGE, mFreeMem);
         //  Pack up the values and broadcast them to everyone
-        Intent lowMemIntent = new Intent(Intent.ACTION_MANAGE_PACKAGE_STORAGE);
+        Intent lowMemIntent = new Intent(Environment.isExternalStorageEmulated()
+                ? Settings.ACTION_INTERNAL_STORAGE_SETTINGS
+                : Intent.ACTION_MANAGE_PACKAGE_STORAGE);
         lowMemIntent.putExtra("memory", mFreeMem);
         lowMemIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
         NotificationManager mNotificationMgr =