Merge "Add more details in the javadocs for getTagIntentAppPreferenceForUser"

     * <p>This returns a mapping of package names for this user id to whether we dispatch Tag

     * intents to the package. {@link #ACTION_NDEF_DISCOVERED}, {@link #ACTION_TECH_DISCOVERED} or

     * {@link #ACTION_TAG_DISCOVERED} will not be dispatched to an Activity if its package is

    *  disallowed.

     * mapped to {@code false}.

     * <p>There are three different possible cases:

     * <p>A package not being in the preference list.

     * It does not contain any Tag intent filters or the user never triggers a Tag detection that

     * matches the intent filter of the package.

     * <p>A package being mapped to {@code true}.

     * When a package has been launched by a tag detection for the first time, the package name is

     * put to the map and by default mapped to {@code true}. The package will receive Tag intents as

     * usual.

     * <p>A package being mapped to {@code false}.

     * The user chooses to disable this package and it will not receive any Tag intents anymore.

     *

     * @param userId the user to whom this preference list will belong to

     * @return a map of the UserId which indicates the mapping from package name to