[Mobile] Detect touch support

platform/commonUI/mobile/src/AgentService.js

@@ -46,6 +46,7 @@ define(
             this.userAgent = userAgent;
             this.mobileName = matches[0];
             this.$window = $window;
+            this.touchEnabled = ($window.ontouchstart !== undefined);
         }
 
         /**
@@ -92,6 +93,14 @@ define(
             return !this.isPortrait();
         };
 
+        /**
+         * Check if the user's device supports a touch interface.
+         * @returns {boolean} true if touch is supported
+         */
+        AgentService.prototype.isTouch = function () {
+            return this.touchEnabled;
+        };
+
         /**
          * Check if the user agent matches a certain named device,
          * as indicated by checking for a case-insensitive substring