add shared member to MemoryDescriptor

PiperOrigin-RevId: 621886673

Author: Closure Team

externs/browser/webassembly.js

@@ -42,7 +42,7 @@ WebAssembly.Module = function(bytes) {};
 WebAssembly.Instance = function(moduleObject, importObject) {};
 
 /**
- * @typedef {{initial:number, maximum:(number|undefined)}}
+ * @typedef {{initial:number, maximum:(number|undefined), shared:(boolean|undefined)}}
  */
 var MemoryDescriptor;