Load only unique dictionary words

- Move UserDictionarySettings to sub package
- Convert cursor to loader

Fix: 22058788
Test: robotests

Change-Id: I1e8828abee58362b815abc210c044b678bf9d578

tests/robotests/src/com/android/settings/language/UserDictionaryPreferenceControllerTest.java

@@ -16,15 +16,16 @@
 
 package com.android.settings.language;
 
+import static com.google.common.truth.Truth.assertThat;
+
 import android.content.Context;
-import android.speech.tts.TtsEngines;
 import android.support.v7.preference.Preference;
 
-import com.android.settings.testutils.SettingsRobolectricTestRunner;
 import com.android.settings.TestConfig;
-import com.android.settings.UserDictionarySettings;
 import com.android.settings.inputmethod.UserDictionaryList;
+import com.android.settings.inputmethod.UserDictionarySettings;
 import com.android.settings.testutils.FakeFeatureFactory;
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
 
 import org.junit.Before;
 import org.junit.Test;
@@ -37,16 +38,12 @@ import org.robolectric.shadows.ShadowApplication;
 
 import java.util.TreeSet;
 
-import static com.google.common.truth.Truth.assertThat;
-
 @RunWith(SettingsRobolectricTestRunner.class)
 @Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
 public class UserDictionaryPreferenceControllerTest {
 
     @Mock(answer = Answers.RETURNS_DEEP_STUBS)
     private Context mContext;
-    @Mock
-    private TtsEngines mTtsEngines;
     private Preference mPreference;
     private TestController mController;