The ornamental design for a roller for floatingmat, as shown and described.
FIG. 1 is a top plan view of a roller for floating mat.
FIG. 2 is a bottom view of the roller for floating mat of FIG. 1.
FIG. 3 is a front elevation view of the roller for floating mat of FIG. 1.
FIG. 4 is a rear elevation view of the roller for floating mat of FIG. 1.
FIG. 5 is a right side elevation view of the roller for floating mat of FIG. 1.
FIG. 6 is a left side elevation view of the roller for floating mat of FIG. 1.
FIG. 7 is an isometric view of the roller for floating mat of FIG. 1.
FIG. 8 is another isometric view of the roller for floating mat of FIG. 1.
FIG. 9 is an environmental isometric view of the roller for floating mat of FIG. 1; and,
FIG. 10 is another environmental isometric view of the roller for floating mat of FIG. 1.
Portions of FIGS. 1 through 10 and the floating mats in FIGS. 9 and 10 are shown in broken and dash-dot-dot-dash lines illustrating portions of the article and environmental subject matter that form no part of the claimed design. The appearance of any portion of the roller for floating mat between the break lines forms no part of the claimed design.