Rearrange a few settings into System category page.

- Use activity-alias to define which activity shows up in what category.
  We choose activity-alias because it creates a reference to UI we need
  without having to define a new set of intent-filter and/or category
  keys. This reduces maintainence in the long run. We should merge
  metadata from activity-alias into targetActivity when cleaning up.

- Created new System dashboard activity that hosts all system category
  tiles dynamically, and a static tile for checking system update.

Bug: 31781480
Test: manual
Test: make RunSettingsRoboTests -j40
Change-Id: Ia2d762e3e1aebd17423a395c5e6c286dc3326492

tests/robotests/src/com/android/settings/dashboard/conditional/DashboardTilePreferenceTest.java

@@ -0,0 +1,78 @@
+/**
+ * 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.dashboard.conditional;
+
+
+import android.content.Context;
+import android.support.v7.preference.PreferenceViewHolder;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.LinearLayout;
+
+import com.android.settings.TestConfig;
+import com.android.settings.dashboard.DashboardTilePreference;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.annotation.Config;
+import org.robolectric.shadows.ShadowApplication;
+
+import static com.google.common.truth.Truth.assertThat;
+
+@RunWith(RobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+public class DashboardTilePreferenceTest {
+
+    private ShadowApplication mShadowApplication;
+    private Context mContext;
+    private PreferenceViewHolder mHolder;
+    private DashboardTilePreference mPreference;
+
+    @Before
+    public void setUp() {
+        mShadowApplication = ShadowApplication.getInstance();
+        mContext = mShadowApplication.getApplicationContext();
+        mPreference = new DashboardTilePreference(mContext);
+
+        LayoutInflater inflater = LayoutInflater.from(mContext);
+        final View view = inflater.inflate(mPreference.getLayoutResource(),
+                new LinearLayout(mContext), false);
+
+        mHolder = new PreferenceViewHolder(view);
+    }
+
+    @Test
+    public void setHasDivider_shouldShowDivider() {
+        mPreference.setDividerAllowedAbove(true);
+        mPreference.setDividerAllowedBelow(true);
+        mPreference.onBindViewHolder(mHolder);
+
+        assertThat(mHolder.isDividerAllowedAbove()).isTrue();
+        assertThat(mHolder.isDividerAllowedBelow()).isTrue();
+    }
+
+    @Test
+    public void setHasNoDivider_shouldHideDivider() {
+        mPreference.setDividerAllowedAbove(false);
+        mPreference.setDividerAllowedBelow(false);
+        mPreference.onBindViewHolder(mHolder);
+
+        assertThat(mHolder.isDividerAllowedAbove()).isFalse();
+        assertThat(mHolder.isDividerAllowedBelow()).isFalse();
+    }
+}