Merge "Clarify docs for FLAG_SYSTEM"

    public int uiOptions = 0;

    /**

     * Value for {@link #flags}: if set, this application is installed in the

     * device's system image.

     * Value for {@link #flags}: if set, this application is installed in the device's system image.

     * This should not be used to make security decisions. Instead, rely on

     * {@linkplain android.content.pm.PackageManager#checkSignatures(java.lang.String,java.lang.String)

     * signature checks} or

     * <a href="https://developer.android.com/training/articles/security-tips#Permissions">permissions</a>.

     *

     * <p><b>Warning:</b> Note that does flag not behave the same as

     * {@link android.R.attr#protectionLevel android:protectionLevel} {@code system} or

     * {@code signatureOrSystem}.

     */

    public static final int FLAG_SYSTEM = 1<<0;