Add Print Preview UI to accept and reject printer sharing invitations.

chrome/browser/resources/print_preview/search/destination_search.css

 /* Copyright (c) 2012 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. */
 
 #destination-search {
   z-index: 3;
 }
 
 #destination-search.transparent {
   opacity: 0;
@@ skipping 46 matching lines @@
 #destination-search .lists {
   -webkit-box-flex: 1;
   overflow-y: auto;
 }
 
 #destination-search .lists > * {
   -webkit-user-select: none;
   padding: 0 14px 18px;
 }
 
+#destination-search .invitation-container {
+  -webkit-animation: invitation-fadein 500ms;
+  background-color: rgb(249, 237, 190);
+  border-top: solid 1px rgb(245, 233, 183);
+  padding: 12px;
+}
+
+@-webkit-keyframes invitation-fadein {
+  from {
+    opacity: 0;
+  }
+  to {
+    opacity: 1;
+  }
+}
+
+#destination-search .invitation-text {
+  -webkit-padding-after: 12px;
+  text-align: center;
+}
+
+#destination-search .invitation-buttons {
+  align-items: center;
+  display: flex;
+  justify-content: center;
+}
+
+#destination-search .invitation-buttons > *:not(:first-child) {
+  -webkit-margin-start: 10px;
+}
+
+#destination-search #invitation-process-throbber {
+  display: block;
+}
+
 #destination-search .cloudprint-promo {
   -webkit-box-align: center;
   -webkit-user-select: none;
   background-color: rgb(249, 237, 190);
   display: -webkit-box;
   padding: 12px;
 }
 
 #destination-search .cloudprint-promo .sign-in.link-button {
   padding: inherit;
@@ skipping 25 matching lines @@
   background-image: -webkit-image-set(
     url('chrome://theme/IDR_CLOSE_DIALOG_H') 1x,
     url('chrome://theme/IDR_CLOSE_DIALOG_H@2x') 2x);
 }
 
 #destination-search .cloudprint-promo .close-button:active {
   background-image: -webkit-image-set(
     url('chrome://theme/IDR_CLOSE_DIALOG_P') 1x,
     url('chrome://theme/IDR_CLOSE_DIALOG_P@2x') 2x);
 }