add a basic TileSet class

src/ol.js

@@ -5,3 +5,4 @@ goog.require("ol.loc");
 goog.require("ol.projection");
 
 goog.require("ol.Tile");
+goog.require("ol.TileSet");

src/ol/TileSet.js

@@ -0,0 +1,40 @@
+goog.provide('ol.TileSet');
+
+/**
+ * The TileSet class. A TileSet instance represents a collection of
+ * tiles. Tiles of a TileSet have the same resolution, width and
+ * height.
+ * @constructor
+ */
+ol.TileSet = function() {
+
+    /**
+     * @private
+     * @type {number|undefined}
+     */
+    this.resolution_ = undefined;
+
+    /**
+     * @private
+     * @type {number|undefined}
+     */
+    this.bounds_ = undefined;
+
+    /**
+     * @private
+     * @type {number|undefined}
+     */
+    this.tileWidth_ = undefined;
+
+    /**
+     * @private
+     * @type {number|undefined}
+     */
+    this.tileHeight_ = undefined;
+
+    /**
+     * @private
+     * @type {Array.<ol.Tile>|undefined}
+     */
+    this.tiles_ = undefined;
+};