Use FooterPreference in AccountSyncSettings page

.Use the new FooterPreference and removed the old FooterPreferenceMixin
 from the AccountSyncSettings page.
.Add the ShadowAuthenticationHelper for commnon shadow util.

Fixes: 138978130
Test: manual test
Test: make RunSettingsRoboTests ROBOTEST_FILTER=com.android.settings.accounts
Change-Id: I93ae46b3b66e7e504320a9ed120ab7948dd06423

tests/robotests/src/com/android/settings/testutils/shadow/ShadowAuthenticationHelper.java

@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2019 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.testutils.shadow;
+
+import android.content.Context;
+import android.graphics.drawable.Drawable;
+import android.os.UserHandle;
+import android.text.TextUtils;
+
+import com.android.settingslib.accounts.AuthenticatorHelper;
+
+import org.robolectric.annotation.Implementation;
+import org.robolectric.annotation.Implements;
+import org.robolectric.annotation.Resetter;
+
+@Implements(AuthenticatorHelper.class)
+public class ShadowAuthenticationHelper {
+    static final String[] TYPES = {"type1", "type2", "type3", "type4"};
+    static final String[] LABELS = {"LABEL1", "LABEL2", "LABEL3", "LABEL4"};
+    private static String[] sEnabledAccount = TYPES;
+
+    protected void __constructor__(Context context, UserHandle userHandle,
+            AuthenticatorHelper.OnAccountsUpdateListener listener) {
+    }
+
+    public static void setEnabledAccount(String[] enabledAccount) {
+        sEnabledAccount = enabledAccount;
+    }
+
+    @Resetter
+    public static void reset() {
+        sEnabledAccount = TYPES;
+    }
+
+    @Implementation
+    protected String[] getEnabledAccountTypes() {
+        return sEnabledAccount;
+    }
+
+    @Implementation
+    protected CharSequence getLabelForType(Context context, final String accountType) {
+        if (TextUtils.equals(accountType, TYPES[0])) {
+            return LABELS[0];
+        } else if (TextUtils.equals(accountType, TYPES[1])) {
+            return LABELS[1];
+        } else if (TextUtils.equals(accountType, TYPES[2])) {
+            return LABELS[2];
+        } else if (TextUtils.equals(accountType, TYPES[3])) {
+            return LABELS[3];
+        }
+        return null;
+    }
+
+    @Implementation
+    protected Drawable getDrawableForType(Context context, final String accountType) {
+        return context.getPackageManager().getDefaultActivityIcon();
+    }
+
+    public static String[] getTypes() {
+        return TYPES;
+    }
+
+    public static String[] getLabels() {
+        return LABELS;
+    }
+}