File issue against Polymer's closure plugin to support more jsdoc cases

[tbosch]

E.g. the transformer version of tsickle emits this code:
Given:

/**
  * @polymerBehavior
  */
const humeAutocompleteBehaviorImpl = ...;

Emitted Closure JS code:

/**
  * @polymerBehavior
  */
const /** @type {?} */ humeAutocompleteBehaviorImpl = ...;

This leads to the error ERROR - Behavior declarations must be annotated with @polymerBehavior.. Looking at the code in Closure, this id because the check looks at the nearest jsdoc comment, which is now /** @type {?} */.