Moving all DB management logic from LauncherProvider into a separate class

This would make it easier to move the controller to LauncherModel

Bug: 277345535
Test: Presubmit
Flag: N/A
Change-Id: I4d044cf41361f400968ef65e18de5d3976fcdec7

tests/src/com/android/launcher3/util/LauncherModelHelper.java

@@ -63,6 +63,7 @@ import com.android.launcher3.model.BgDataModel;
 import com.android.launcher3.model.BgDataModel.Callbacks;
 import com.android.launcher3.model.DatabaseHelper;
 import com.android.launcher3.model.ItemInstallQueue;
+import com.android.launcher3.model.ModelDbController;
 import com.android.launcher3.model.data.AppInfo;
 import com.android.launcher3.model.data.ItemInfo;
 import com.android.launcher3.pm.InstallSessionHelper;
@@ -471,16 +472,16 @@ public class LauncherModelHelper {
 
         @Override
         public boolean onCreate() {
+            mModelDbController = new ModelDbController(getContext());
             return true;
         }
 
         public SQLiteDatabase getDb() {
-            createDbIfNotExists();
-            return mOpenHelper.getWritableDatabase();
+            return mModelDbController.getDatabaseHelper().getWritableDatabase();
         }
 
         public DatabaseHelper getHelper() {
-            return mOpenHelper;
+            return mModelDbController.getDatabaseHelper();
         }
     }