[CUPS] Implement the local CUPS printer setup waiting UI.

chrome/browser/resources/print_preview/search/destination_list_item.html

 <li id="destination-list-item-template" class="destination-list-item" hidden
     tabindex="0">
   <span class="destination-list-item-content">
     <img class="destination-list-item-icon" alt="">
     <span class="destination-list-item-name"></span>
     <span class="offline-status" hidden></span>
     <span class="register-promo" hidden>
       <button class="register-promo-button">
         $i18n{registerPromoButtonText}
       </button>
     </span>
     <span class="extension-controlled-indicator" hidden>
       <span class="extension-name"></span>
       <span class="extension-icon" role="button" tabindex="0"></span>
     </span>
+    <span class="configuring-in-progress-text" hidden>
+      <span>$i18n{configuringInProgressText}</span>
+      <span class="jumping-dots">
+        <span>.</span><span>.</span><span>.</span>

[dpapad, 2017/03/30 20:56:23]

Can you check if this animation is running in the background, even when the span
is hidden? If so, that would be bad for performance, and we should consider
something else (either stopping the animation, or using a spinner that we start
and stop).

[xdai1, 2017/03/30 23:18:43]

Since it's an infinite animation, I think it's still running in the background.
I manually start or stop the animation when the message gets shown or hidden. 

+      </span>
+    </span>
+    <span class="configuring-failed-text" hidden>
+      <span>$i18n{configuringFailedText}</span>

[dpapad, 2017/03/30 20:56:23]

Are both <span>s necessary? Why not

<span class="configuring-failed-text" hidden>
  $i18n{configuringFailedText}
</span>

[xdai1, 2017/03/30 23:18:43]

Removed it.

+    </span>
   </span>
 </li>