Add display of available bluetooth devices, and mechanism for retrieving the list.

chrome/browser/resources/options/chromeos/system_options_page.css

 .touchpad-sensitivity-more {
   float: right;
 }
 
 html[dir=rtl] .touchpad-sensitivity-more {
   float: left;
 }
 
 .option-name {
    display: inline;
 }
 
 #timezone-value {
    display: inline-block;
    vertical-align: baseline;
 }
 
 #touchpad-value,
 #slider-control {
    display: inline-block;
    vertical-align: top;
 }
 
-#bluetooth-options-div{
+#bluetooth-options-div {
   -webkit-box-orient: vertical;
   display: -webkit-box;
 }
+
+#bluetooth-finder-container,
+#bluetooth-scanning-status {
+  -webkit-box-orient: horizontal;
+  display: -webkit-box;
+  vertical-align: baseline;
+}
+
+#bluetooth-scanning-label {
+  -webkit-margin-start: 5px;
+  -webkit-transition: 0.25s opacity;
+  color: gray;
+}
+
+#bluetooth-scanning-icon {
+  -webkit-margin-start: 10px;
+  -webkit-transition: 0.25s opacity;
+  background-image: url("loader.gif");
+  height: 24px;
+  margin-top: 3px;
+  width: 24px;
+}
+
+.bluetooth-headset,
+.bluetooth-keyboard,
+.bluetooth-mouse {
+  background-repeat: no-repeat;
+}
+
+.bluetooth-headset {
+  background-image: url("headset.png");
+}
+
+.bluetooth-keyboard {
+  background-image: url("keyboard.png");
+}
+
+.bluetooth-mouse {
+  background-image: url("mouse.png");
+}