Merge "Fix Recent thumbnails aren't taken when leaving an activity via notification"

        return BAD_VALUE;

    // make sure none of the layers are protected

    const Vector< sp<LayerBase> >& layers(mVisibleLayersSortedByZ);

    const LayerVector& layers(mDrawingState.layersSortedByZ);

    const size_t count = layers.size();

    for (size_t i=0 ; i<count ; ++i) {

        const sp<LayerBase>& layer(layers[i]);