Pass value to custom validation function.

Validation function was not being passed value. I think you meant to do that.

PS: You guys will need a testing suite before you get in too deep. But I like you a lot more than angular.

core-input.html

@@ -199,7 +199,7 @@
         } else if (this.validate.exec) {
           valid = this.validate.exec(this.inputValue);
         } else if (this.validate instanceof Function) {
-          valid = this.validate.call(this.inputValue);
+          valid = this.validate.call(this, this.inputValue);
         }
 
         this.invalid = !valid;