First draft of wifi display settings UI.

All of the functionality is in place but the UI is
not fully polished yet.

Bug: 7178216
Change-Id: Id76843bff05cc71e5c02a31bc97c7070d58fff10

src/com/android/settings/bluetooth/BluetoothSettings.java

@@ -282,7 +282,8 @@ public final class BluetoothSettings extends DeviceListPreferenceFragment {
 
                 // Available devices category
                 if (mAvailableDevicesCategory == null) {
-                    mAvailableDevicesCategory = new ProgressCategory(getActivity(), null);
+                    mAvailableDevicesCategory = new ProgressCategory(getActivity(), null,
+                            R.string.bluetooth_no_devices_found);
                 } else {
                     mAvailableDevicesCategory.removeAll();
                 }