Add back a SYNC_SETTINGS screen

Revive the old Accounts&Sync screen as a dialog with the auto-sync
checkbox and a list of accounts. This will be launched when Apps
request a SYNC_SETTINGS page for controlling account and master sync.

Auto-sync data checkbox will also continue to exist in Data Usage.

Minor fixes to account list and account update monitoring.

Bug: 6614013
Bug: 6622995
Bug: 6610247
Change-Id: I35c0919a29c6bc7e5edf64f2734a3ef4f5ae5e7a

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

@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2012 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.content.Intent;
+import android.preference.PreferenceActivity;
+
+/**
+ * Launcher activity for the SyncSettings fragment.
+ *
+ */
+public class SyncSettingsActivity extends PreferenceActivity {
+    @Override
+    public Intent getIntent() {
+        Intent modIntent = new Intent(super.getIntent());
+        modIntent.putExtra(EXTRA_SHOW_FRAGMENT, SyncSettings.class.getName());
+        modIntent.putExtra(EXTRA_NO_HEADERS, true);
+        return modIntent;
+    }
+}