DevTools: [JsDocValidator] Be smarter about function name and JSDoc detection

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

 function badFuncNoAnnotation() {
     return 1; // ERROR - no @return annotation.
 }
 
 /**
  * @return {number}
  */
 function badFuncAnnotatedButNoReturn() // ERROR - no @return annotation.
 {
 }
@@ skipping 66 matching lines @@
 }
 
 TypeOne.prototype = {
     badApiMethodNoAnnotation: function() // ERROR - public method.
     {
         return 1;
     },
 
     _privateMethod: function() // OK - non-public method.
     {
+        var obj = {};
+
+        /**
+         * @constructor
+         * @param {number} val
+         */
+        obj["a"] = obj["b"] = function(val) { // OK - constructor
+            this.foo = val;
+        }
+
+        /**
+         * @param {number} val
+         */
+        obj["c"] = obj["d"] = function(val) { // ERROR - no @this
+            this.foo = val;
+        }
+
         return 1;
     },
 
     methodTwo: function()
     {
         function callback() // OK - not a method.
         {
             return 1;
         }
     },
@@ skipping 244 matching lines @@
  * @param {string} a
  * @param {string} c
  */
 function funcParamsMissingTag1(a, b, c) {}
 
 /**
  * @param {string} a
  */
 function funcParamsMissingTag2(a, b, c) {}