Add a new developer options screen for shared data.

Add a new Storage section in the developer options menu which has a
new Shared Data preference. This preference screen shows all shared data
blobs on the device. There is also a new screen for each data blob which
shows all of the packages which currently have a leases on it. This
screen also has a button to delete the shared data blob.

Bug: 150626561
Test: make RunSettingsRoboTests ROBOTEST_FILTER=SharedDataPreferenceControllerTest
Test: manual (visual)
Change-Id: Id84a33dc7eeac493b2f81d3996ad24ee70557a07

tests/robotests/src/com/android/settings/development/storage/SharedDataPreferenceControllerTest.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2020 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.storage;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.app.blob.BlobStoreManager;
+import android.content.Context;
+
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.R;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.util.ReflectionHelpers;
+
+// TODO: add more detailed tests for the shared data screens
+@RunWith(RobolectricTestRunner.class)
+public class SharedDataPreferenceControllerTest {
+
+    @Mock
+    private Context mContext;
+    @Mock
+    private BlobStoreManager mBlobStoreManager;
+    @Mock
+    private Preference mPreference;
+    @Mock
+    private PreferenceScreen mScreen;
+
+    private SharedDataPreferenceController mController;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mController = spy(new SharedDataPreferenceController(mContext));
+
+        when(mScreen.findPreference(mController.getPreferenceKey())).thenReturn(mPreference);
+        mController.displayPreference(mScreen);
+    }
+
+    @Test
+    public void updateState_BlobManagerIsNotNull_preferenceIsEnabled() {
+        ReflectionHelpers.setField(mController, "mBlobStoreManager", mBlobStoreManager);
+        mController.updateState(mPreference);
+
+        verify(mPreference).setEnabled(true);
+        assertThat(mPreference.getSummary())
+                .isEqualTo(mContext.getString(R.string.shared_data_summary));
+    }
+
+    @Test
+    public void updateState_BlobManagerIsNull_preferenceIsDisabled() {
+        ReflectionHelpers.setField(mController, "mBlobStoreManager", null);
+        mController.updateState(mPreference);
+
+        verify(mPreference).setEnabled(false);
+    }
+}