PDF Plugin: Add compile targets for a few more files.

chrome/browser/resources/pdf/elements/viewer-password-screen/viewer-password-screen.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 Polymer({
   is: 'viewer-password-screen',
 
   properties: {
     invalid: Boolean,
 
     strings: Object,
   },
 
   get active() {
     return this.$.dialog.open;
   },
 
   show: function() {
     this.$.dialog.showModal();
   },
 
   close: function() {
     if (this.active)
       this.$.dialog.close();
   },
 
   deny: function() {
-    this.$.password.disabled = false;
+    var password = /** @type {!PaperInputElement} */ (this.$.password);
+    password.disabled = false;
     this.$.submit.disabled = false;
     this.invalid = true;
-    this.$.password.focus();
-    this.$.password.inputElement.select();
+    password.focus();
+    password.inputElement.select();
   },
 
   submit: function() {
-    if (this.$.password.value.length == 0)
+    var password = /** @type {!PaperInputElement} */ (this.$.password);
+    if (password.value.length == 0)
       return;
-    this.$.password.disabled = true;
+    password.disabled = true;
     this.$.submit.disabled = true;
-    this.fire('password-submitted', {password: this.$.password.value});
+    this.fire('password-submitted', {password: password.value});
   },
 });