Add storage dashborad page.

Refactor shared dashboard page display logic between storage and
system page.

Bug: 31800690
Test: RunSettingsRoboTests

Change-Id: I7eb86f590b79ab871bdb383fb2f5326790beb193

src/com/android/settings/deviceinfo/StorageDashboardFragment.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2016 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.deviceinfo;
+
+import android.content.Context;
+import android.os.Bundle;
+import android.support.v7.preference.PreferenceScreen;
+
+import com.android.settings.R;
+import com.android.settings.dashboard.DashboardFragment;
+
+public class StorageDashboardFragment extends DashboardFragment {
+
+    private static final String TAG = "StorageDashboardFrag";
+
+    @Override
+    public int getMetricsCategory() {
+        return STORAGE_CATEGORY_FRAGMENT;
+    }
+
+    @Override
+    public void onAttach(Context context) {
+        super.onAttach(context);
+        addPreferenceController(new ManageStoragePreferenceController(context));
+    }
+
+    @Override
+    public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
+        super.onCreatePreferences(savedInstanceState, rootKey);
+        refreshAllPreferences();
+    }
+
+    @Override
+    public void onCategoriesChanged() {
+        refreshAllPreferences();
+    }
+
+    private void refreshAllPreferences() {
+        PreferenceScreen screen = getPreferenceScreen();
+        if (screen != null) {
+            screen.removeAll();
+        }
+        addPreferencesFromResource(R.xml.storage_dashboard_fragment);
+
+        getPreferenceController(ManageStoragePreferenceController.class)
+                .displayPreference(getPreferenceScreen());
+
+        displayTilesAsPreference(TAG, getPreferenceScreen(),
+                mDashboardFeatureProvider.getTilesForStorageCategory());
+    }
+}