Fix bump scrolling doesn't work if the app is in fullscreen mode before connecting.

With the change, https://codereview.chromium.org/875583002, it is
possible to start a remote connection in fullscreen mode, we simply
need to notify the DesktopConnectedView that we are in fullscreen upon connecting.

BUG=461609

Review URL: https://codereview.chromium.org/958693002

Cr-Commit-Position: refs/heads/master@{#318130}

remoting/webapp/crd/js/desktop_connected_view.js

@@ -307,8 +307,10 @@ remoting.DesktopConnectedView.prototype.updateClientSessionUi_ = function(
     document.body.classList.add('connected');
     this.container_.addEventListener(
         'mousemove', this.updateMouseCursorPosition_, true);
+
     // Activate full-screen related UX.
     remoting.fullscreen.addListener(this.callOnFullScreenChanged_);
+    this.onFullScreenChanged_(remoting.fullscreen.isActive());
     this.setFocusHandlers_();
   }
 };