Add more logs to investigate empty launcher restore

Flag: EXEMPT logs
Test: presubmit
Bug: 377510898
Change-Id: I1c05b90c9e1337663c4c06703ad14b6c0d00aa07

src/com/android/launcher3/provider/RestoreDbTask.java

@@ -124,11 +124,13 @@ public class RestoreDbTask {
         LauncherPrefs.get(context).removeSync(RESTORE_DEVICE);
 
         DeviceGridState deviceGridState = new DeviceGridState(context);
+        FileLog.d(TAG, "restoreIfNeeded: deviceGridState from context: " + deviceGridState);
         String oldPhoneFileName = deviceGridState.getDbFile();
         List<String> previousDbs = existingDbs(context);
         removeOldDBs(context, oldPhoneFileName);
         // The idp before this contains data about the old phone, after this it becomes the idp
         // of the current phone.
+        FileLog.d(TAG, "Resetting IDP to default for restore dest device");
         idp.reset(context);
         trySettingPreviousGridAsCurrent(context, idp, oldPhoneFileName, previousDbs);
     }
@@ -144,17 +146,24 @@ public class RestoreDbTask {
                 context, oldPhoneDbFileName);
         // The grid option could be null if current phone doesn't support the previous db.
         if (oldPhoneGridOption != null) {
+            FileLog.d(TAG, "trySettingPreviousGridAsCurrent:"
+                    + ", oldPhoneDbFileName: " + oldPhoneDbFileName
+                    + ", oldPhoneGridOption: " + oldPhoneGridOption
+                    + ", previousDbs: " + previousDbs);
 
             /* If the user only used the default db on the previous phone and the new default db is
              * bigger than or equal to the previous one, then keep the new default db */
             if (previousDbs.size() == 1 && oldPhoneGridOption.numColumns <= idp.numColumns
                     && oldPhoneGridOption.numRows <= idp.numRows) {
                 /* Keep the user in default grid */
+                FileLog.d(TAG, "Keeping default db from restore as current grid");
                 return;
             }
             /*
              * Here we are setting the previous db as the current one.
              */
+            FileLog.d(TAG, "Setting grid from old device as current grid: "
+                + "oldPhoneGridOption:" + oldPhoneGridOption.name);
             idp.setCurrentGrid(context, oldPhoneGridOption.name);
         }
     }