The ornamental design for a tray, as shown and described.
FIG. 1 is a perspective view of a tray showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a right side elevational view thereof, the left side elevational view being a mirror image;
FIG. 5 is a front elevational view thereof;
FIG. 6 is a rear elevational view thereof;
FIG. 7 is a top perspective view of the tray as secured to the edge of a table top when using the tray for eating purposes; and,
FIG. 8 is a top perspective view of the tray as positioned on a table or floor when using the tray for drawing purposes.
The broken line showing of a portion of a table top, a girl with a cup and chair in FIG. 7, and a girl with paper and crayons in FIG. 8 is for illustrative purposes only and forms no part of the claimed design.