Implement development UI for background check.

Allows you to toggle off full background access for
whatever apps you want.

Change-Id: I8542ecac1449ccd65dc18af3c0ca1fc18443f89c

src/com/android/settings/Settings.java

@@ -61,6 +61,7 @@ public class Settings extends SettingsActivity {
             return super.isValidFragment(className);
             }
     }
+    public static class BackgroundCheckSummaryActivity extends SettingsActivity { /* empty */ }
     public static class StorageUseActivity extends SettingsActivity { /* empty */ }
     public static class DevelopmentSettingsActivity extends SettingsActivity { /* empty */ }
     public static class AccessibilitySettingsActivity extends SettingsActivity { /* empty */ }