Merge "Save one notifyColorListeners() call" into sc-dev am: 8c9039fc

            needsExtraction = wallpaper.primaryColors == null;

        }

        // Let's notify the current values, it's fine if it's null, it just means

        // that we don't know yet.

        notifyColorListeners(wallpaper.primaryColors, which, wallpaper.userId, displayId);

        if (needsExtraction) {

            extractColors(wallpaper);

            synchronized (mLock) {

                // Don't need to notify if nothing changed.

                if (wallpaper.primaryColors == null) {

                    return;

                }

        }

        notifyColorListeners(wallpaper.primaryColors, which, wallpaper.userId, displayId);

    }

    }

    private static <T extends IInterface> boolean emptyCallbackList(RemoteCallbackList<T> list) {

        return (list == null || list.getRegisteredCallbackCount() == 0);