Restrict screen saver settings searches to enabled users.

If a user can't enable screen saver, they shouldn't be able to
accidentally find screen saver related settings in Settings.

Bug: 260276394
Test: atest ScreenSaverPreferenceControllerTest
Test: manually by settings up a second user on a device that supports
screen saver, switching to that user, and making sure that searches for
"screen saver" don't accidentally reveal settings that can't be
accessed.

Merged-In: If2f465b2acb548455f0868507cf47217ea1a626f
Change-Id: I96fb8f9c6c4960f203b51bb43994f7bafdcefdf5

src/com/android/settings/Utils.java

@@ -1229,4 +1229,22 @@ public final class Utils extends com.android.settingslib.Utils {
     public static int getHomepageIconColorHighlight(Context context) {
         return context.getColor(R.color.accent_select_primary_text);
     }
+
+    /**
+     * Returns if dreams are available to the current user.
+     */
+    public static boolean areDreamsAvailableToCurrentUser(Context context) {
+        if (!context.getResources().getBoolean(
+                com.android.internal.R.bool.config_dreamsSupported)) {
+            return false;
+        }
+
+        if (!context.getResources().getBoolean(
+                com.android.internal.R.bool.config_dreamsOnlyEnabledForDockUser)) {
+            return true;
+        }
+
+        final UserManager userManager = context.getSystemService(UserManager.class);
+        return userManager != null && userManager.isSystemUser();
+    }
 }