Print Preview: Display a throbber when the user requests the system print

chrome/browser/resources/print_preview/print_preview.css

 html {
   height: 100%;
 }
 
 body {
   background: white;
   display: -webkit-box;
   height: 100%;
   margin: 0;
   overflow: hidden;
@@ skipping 17 matching lines @@
   min-height: 0;
 }
 
 body #main::after {
   content: '';
   display: block;
 }
 
 /* Layout: Sidebar */
 
-.sidebar {
+#sidebar {
   -webkit-user-select: none;
   border: 1px solid #a0a0a0;
   background: white;
   height: 100%;
   overflow-x: hidden;
   overflow-y: auto;
   position: relative;
   width: 310px;
   z-index: 2000;
 }
 
-.sidebar header {
+#sidebar header {
   width: 310px;
 }
 
-.sidebar header > h1 {
+#sidebar header > h1 {
   -webkit-padding-start: 16px;
 }
 
 #system-dialog-div {
   -webkit-padding-start: 16px;
   font-size: 13px;
   line-height: 22px;
 }
 
 /* Header */
@@ skipping 104 matching lines @@
 }
 
 hr.invisible {
   visibility: hidden;
 }
 
 .hidden + hr {
   display: none;
 }
 
-a {
+/* TODO(jhawkins): Remove this specialization once all WebUI shares the same
+ * link-button styling.
+ */
+#system-dialog-link {
+  -webkit-padding-start: 0;
   -webkit-transition: text-shadow 150ms;
   color: #4080fa;
   outline: 0;
   text-decoration: none;
   text-shadow: 0 0 1px white;
 }
 
-a:hover {
+#system-dialog-link:hover {
   text-shadow: 0 0 1px rgba(85, 143, 250, .75);
 }
 
-a:active {
+#system-dialog-link:active {
   color: #4080fa;
   text-shadow: 0 0 1px rgba(64, 128, 250, 1);
 }
 
-a:focus {
+#system-dialog-link:focus {
   -webkit-transition: border-color 200ms;
   border-radius: 2px;
   border: 1px solid rgba(85, 143, 250, .8);
   margin: -2px -5px;
   padding: 1px 4px;
 }
 
+#system-dialog-link:disabled {
+  color: rgba(0, 0, 0, .5);
+  cursor: default;
+  text-shadow: none;
+}
+
 strong {
   font-weight: 600;
 }
 
 button {
   -webkit-box-shadow: inset 0 1px 2px white,
                       0 1px 2px rgba(0, 0, 0, .2);
   -webkit-user-select: none;
   background: -webkit-linear-gradient(#fafafa, #dcdcdc);
   border-radius: 3px;
@@ skipping 538 matching lines @@
   -webkit-animation-delay: 300ms;
 }
 
 #two-sided-div {
   margin-top: 10px;
 }
 
 input[disabled] + label {
   color: gray;
 }
+
+#error-action-area {
+  margin-top: 10px;
+}