DevTools: [JsDocValidator] Handle types declared as top-level vars

Source/devtools/scripts/jsdoc-validator/tests/proto.js

 /**
  * @constructor
  */
 Base = function() {}
 
 /**
  * @constructor
  * @extends {Base}
  */
 DerivedNoProto = function() {}
@@ skipping 70 matching lines @@
 /**
  * @extends {Base}
  */
 GoodDerived = function() {
     Base.call(this);
 }
 
 GoodDerived.prototype = {
     __proto__: Base.prototype
 }
+
+/**
+ * @constructor
+ * @template T
+ */
+var Set = function() {}
+
+Set.prototype = {
+    add: function(item) {},
+    remove: function(item) {},
+    /** @return {boolean} */
+    contains: function(item) { return true; }
+}
+
+/**
+ * @constructor
+ * @extends {Set.<T>}
+ * @template T
+ */
+var GoodSetSubclass = function()
+{
+    Set.call(this);
+}
+
+GoodSetSubclass.prototype = {
+    __proto__: Set.prototype
+}
+
+/**
+ * @constructor
+ * @extends {Set.<T>}
+ * @template T
+ */
+var BadSetSubclass = function()
+{
+}
+
+BadSetSubclass.prototype = {
+}