Create AndroidSpellCheckerSessionFactory

Bug: 6789576
Change-Id: I6de1e1aa64cf14f38ecb250579418bc518f0d838

java/src/com/android/inputmethod/latin/spellcheck/AndroidSpellCheckerService.java

@@ -184,7 +184,9 @@ public class AndroidSpellCheckerService extends SpellCheckerService
 
     @Override
     public Session createSession() {
-        return new AndroidSpellCheckerSession(this);
+        // Should not refer to AndroidSpellCheckerSession directly considering
+        // that AndroidSpellCheckerSession may be overlaid.
+        return AndroidSpellCheckerSessionFactory.newInstance(this);
     }
 
     public static SuggestionsInfo getNotInDictEmptySuggestions() {

java/src/com/android/inputmethod/latin/spellcheck/AndroidSpellCheckerSession.java

@@ -16,7 +16,6 @@
 
 package com.android.inputmethod.latin.spellcheck;
 
-
 import android.service.textservice.SpellCheckerService.Session;
 import android.text.TextUtils;
 import android.util.Log;

java/src/com/android/inputmethod/latin/spellcheck/AndroidSpellCheckerSessionFactory.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+package com.android.inputmethod.latin.spellcheck;
+
+import android.service.textservice.SpellCheckerService.Session;
+
+public abstract class AndroidSpellCheckerSessionFactory {
+    public static Session newInstance(AndroidSpellCheckerService service) {
+        return new AndroidSpellCheckerSession(service);
+    }
+}