Declare Navigator.prototype.canShare()

See https://developer.mozilla.org/en-US/docs/Web/API/Navigator/canShare

PiperOrigin-RevId: 324427749

Author: Closure Team

externs/browser/html5.js

@@ -5289,6 +5289,13 @@ Navigator.prototype.deviceMemory;
  */
 Navigator.prototype.storage;
 
+/**
+ * @param {!ShareData=} data
+ * @return {boolean}
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/Navigator/canShare
+ */
+Navigator.prototype.canShare = function(data) {};
+
 /**
  * @param {!ShareData=} data
  * @return {!Promise<undefined>}