Send latest screen size with every update.

lib/units/device/plugins/vnc/util/connection.js

@@ -92,6 +92,7 @@ var StateReverse = Object.create(null), State = {
 }
 
 VncConnection.ENCODING_RAW = 0
+VncConnection.ENCODING_DESKTOPSIZE = -223
 
 Object.keys(State).map(function(name) {
   VncConnection[name] = State[name]
@@ -122,6 +123,8 @@ VncConnection.prototype.writeFramebufferUpdate = function(rectangles) {
     case VncConnection.ENCODING_RAW:
       this._write(rect.data)
       break
+    case VncConnection.ENCODING_DESKTOPSIZE:
+      break
     default:
       throw new Error(util.format(
         'Unsupported encoding type', rect.encodingType))