Add a new About Phone page.

This adds the "Me Card" page. The current functionality is to show
information based upon the first account added to the system. The page
shows the user's avatar, name, primary account, and phone number.

Bug: 63819909
Test: Robotest

Change-Id: I64bfae922e828994b2b87009d0647e67dab0da42

src/com/android/settings/accounts/AccountFeatureProvider.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2018 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.accounts;
+
+import android.accounts.Account;
+import android.content.Context;
+import android.util.FeatureFlagUtils;
+
+import com.android.settings.core.FeatureFlags;
+
+public interface AccountFeatureProvider {
+    String getAccountType();
+    Account[] getAccounts(Context context);
+    /**
+     * Checks whether or not to display the new About Phone page.
+     */
+    default boolean isMeCardEnabled(Context context) {
+        return FeatureFlagUtils.isEnabled(context, FeatureFlags.ABOUT_PHONE_V2);
+    }
+}

src/com/android/settings/accounts/AccountFeatureProviderImpl.java

@@ -0,0 +1,16 @@
+package com.android.settings.accounts;
+
+import android.accounts.Account;
+import android.content.Context;
+
+public class AccountFeatureProviderImpl implements AccountFeatureProvider {
+    @Override
+    public String getAccountType() {
+        return null;
+    }
+
+    @Override
+    public Account[] getAccounts(Context context) {
+        return new Account[0];
+    }
+}