Add drive_deleted_list and drive_largest_change_id

MyTracks/res/values/keys.xml

@@ -65,6 +65,8 @@ limitations under the License.
 
   <!-- Keys for persistend preferences. But they should not get backed up or restored. -->
   <string name="auto_resume_track_current_retry_key">autoResumeTrackCurrentRetry</string>
+  <string name="drive_deleted_list_key">driveDeletedList</string>
+  <string name="drive_largest_change_id_key">driveLargestChangeId</string>
   <string name="recording_track_id_key">recordingTrackId</string>
   <string name="recording_track_paused_key">recordingTrackPaused</string>
   <string name="selected_track_id_key">selectedTrackId</string>

MyTracks/src/com/google/android/apps/mytracks/io/backup/PreferenceBackupHelper.java

@@ -45,6 +45,8 @@ public class PreferenceBackupHelper {
   public PreferenceBackupHelper(Context context) {
     doNotBackup = new HashSet<String>();
     doNotBackup.add(context.getString(R.string.auto_resume_track_current_retry_key));
+    doNotBackup.add(context.getString(R.string.drive_deleted_list_key));
+    doNotBackup.add(context.getString(R.string.drive_largest_change_id_key));
     doNotBackup.add(context.getString(R.string.recording_track_id_key));
     doNotBackup.add(context.getString(R.string.recording_track_paused_key));
     doNotBackup.add(context.getString(R.string.selected_track_id_key));

MyTracks/src/com/google/android/apps/mytracks/util/PreferencesUtils.java

@@ -50,6 +50,8 @@ public class PreferencesUtils {
   public static final boolean CHART_SHOW_SPEED_DEFAULT = true;
   public static final String DEFAULT_ACTIVITY_DEFAULT = "";
   public static final boolean DEFAULT_MAP_PUBLIC_DEFAULT = false;
+  public static final String DRIVE_DELETED_LIST_DEFAULT = "";
+  public static final long DRIVE_LARGEST_CHANGE_ID_DEFAULT = -1L;
   public static final boolean DRIVE_SYNC_DEFAULT = false;  
   
   // Value for split_frequency_key and voice_frequency_key