Update bower.json for Polymer elements and add PRESUBMIT.py

third_party/polymer/v1_0/components/paper-dialog-behavior/paper-dialog-behavior.html

 <!--
 @license
 Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
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@@ skipping 34 matching lines @@
 ----------------|-------------|----------
 `--paper-dialog-background-color` | Dialog background color                     | `--primary-background-color`
 `--paper-dialog-color`            | Dialog foreground color                     | `--primary-text-color`
 `--paper-dialog`                  | Mixin applied to the dialog                 | `{}`
 `--paper-dialog-title`            | Mixin applied to the title (`<h2>`) element | `{}`
 `--paper-dialog-button-color`     | Button area foreground color                | `--default-primary-color`
 
 ### Accessibility
 
 This element has `role="dialog"` by default. Depending on the context, it may be more appropriate
-to override this attribute with `role="alertdialog"`. The header (a `<h2>` element) will
+to override this attribute with `role="alertdialog"`.
 
 If `modal` is set, the element will set `aria-modal` and prevent the focus from exiting the element.
 It will also ensure that focus remains in the dialog.
 
 The `aria-labelledby` attribute will be set to the header element, if one exists.
 
 @hero hero.svg
 @demo demo/index.html
 @polymerBehavior Polymer.PaperDialogBehavior
 */
@@ skipping 100 matching lines @@
       this.setAttribute('aria-labelledby', labelledById);
     },
 
     _updateClosingReasonConfirmed: function(confirmed) {
       this.closingReason = this.closingReason || {};
       this.closingReason.confirmed = confirmed;
     },
 
     _onDialogClick: function(event) {
       var target = event.target;
-      while (target !== this) {
-        if (target.hasAttribute('dialog-dismiss')) {
-          this._updateClosingReasonConfirmed(false);
-          this.close();
-          break;
-        } else if (target.hasAttribute('dialog-confirm')) {
-          this._updateClosingReasonConfirmed(true);
-          this.close();
-          break;
+      while (target && target !== this) {
+        if (target.hasAttribute) {
+          if (target.hasAttribute('dialog-dismiss')) {
+            this._updateClosingReasonConfirmed(false);
+            this.close();
+            break;
+          } else if (target.hasAttribute('dialog-confirm')) {
+            this._updateClosingReasonConfirmed(true);
+            this.close();
+            break;
+          }
         }
         target = target.parentNode;
       }
     },
 
     _onIronOverlayOpened: function() {
       if (this.modal) {
         document.body.addEventListener('focus', this._boundOnFocus, true);
         this.backdropElement.addEventListener('click', this._boundOnBackdropClick);
       }
@@ skipping 33 matching lines @@
         }
       }
     }
 
   };
 
   /** @polymerBehavior */
   Polymer.PaperDialogBehavior = [Polymer.IronOverlayBehavior, Polymer.PaperDialogBehaviorImpl];
 
 </script>