Remove DevelopmentTileConfigActivity and clean up fragment.

- The tile activity is internal to Settings and nobody should launch it
  externally, thus it doesn't need to have its own activity. Preference
  framework can launch the fragment as a SubSetting

Fixes: 67603649
Test: robotests
Change-Id: I9ba2fc55eb7f571f816ec045567f2dd2714c44e8

src/com/android/settings/development/qstile/DevelopmentTileConfigFragment.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2017 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.settings.development.qstile;
+
+import android.content.Context;
+
+import com.android.internal.logging.nano.MetricsProto;
+import com.android.settings.R;
+import com.android.settings.dashboard.DashboardFragment;
+import com.android.settingslib.core.AbstractPreferenceController;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class DevelopmentTileConfigFragment extends DashboardFragment {
+    private static final String TAG = "DevelopmentTileConfig";
+
+
+    @Override
+    protected String getLogTag() {
+        return TAG;
+    }
+
+    @Override
+    protected int getPreferenceScreenResId() {
+        return R.xml.placeholder_prefs;
+    }
+
+    @Override
+    protected List<AbstractPreferenceController> getPreferenceControllers(Context context) {
+        final List<AbstractPreferenceController> controllers = new ArrayList<>();
+        controllers.add(new DevelopmentTilePreferenceController(context));
+        return controllers;
+    }
+
+    @Override
+    public int getMetricsCategory() {
+        return MetricsProto.MetricsEvent.DEVELOPMENT_QS_TILE_CONFIG;
+    }
+}