Add feature flag for new DataUsageSummary fragment.

Creates a new fragment DataUsageSummaryLegacy, which is used
instead of DataUsageSummary when the feature flag is off (default
behavior).

Copies the current DataUsageSummary.java, data_usage.xml, and
DataUsageSummaryActivity to create the legacy versions. This
change allows for uninterupted development of new features in the
DataUsageSummary fragment.

Test: manual
Test: make RunSettingsRoboTests
Bug: 70950124
Change-Id: I9d79e108bbfc1c8ec620f86c0183f4ed3f41c9d7

tests/robotests/src/com/android/settings/datausage/DataUsageSummaryLegacyTest.java

@@ -0,0 +1,85 @@
+/*
+ * 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.datausage;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.mockito.Matchers.anyInt;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.content.Context;
+import android.net.ConnectivityManager;
+import android.net.wifi.WifiConfiguration;
+import android.net.wifi.WifiManager;
+import android.text.format.Formatter;
+
+import com.android.settings.R;
+import com.android.settings.TestConfig;
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
+import com.android.settings.testutils.shadow.SettingsShadowResources;
+import com.android.settingslib.NetworkPolicyEditor;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.annotation.Config;
+import org.robolectric.shadows.ShadowApplication;
+import org.robolectric.util.ReflectionHelpers;
+
+import java.util.ArrayList;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+public class DataUsageSummaryLegacyTest {
+    @Mock
+    private ConnectivityManager mManager;
+    private Context mContext;
+
+    /**
+     * This set up is contrived to get a passing test so that the build doesn't block without tests.
+     * These tests should be updated as code gets refactored to improve testability.
+     */
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        ShadowApplication shadowContext = ShadowApplication.getInstance();
+        shadowContext.setSystemService(Context.CONNECTIVITY_SERVICE, mManager);
+        mContext = shadowContext.getApplicationContext();
+        when(mManager.isNetworkSupported(anyInt())).thenReturn(true);
+    }
+
+    @Test
+    @Config(shadows = {
+            SettingsShadowResources.class,
+            SettingsShadowResources.SettingsShadowTheme.class
+    })
+    public void formatUsage_shouldLookLikeFormatFileSize() {
+        SettingsShadowResources.overrideResource(com.android.internal.R.string.fileSizeSuffix,
+                "%1$s %2$s");
+        final long usage = 2147483648L; // 2GB
+        final String formattedUsage =
+                DataUsageSummaryLegacy.formatUsage(mContext, "^1", usage).toString();
+        final String formattedAsFileSize = Formatter.formatFileSize(mContext, usage);
+        assertThat(formattedUsage).isEqualTo(formattedAsFileSize);
+    }
+}