[AppRemoting] Implement ConnectionDroppedDialog.

remoting/webapp/base/js/window_shape.js

Index: remoting/webapp/base/js/window_shape.js
diff --git a/remoting/webapp/base/js/window_shape.js b/remoting/webapp/base/js/window_shape.js
index ad887bbe3c3c81b1fab4e427200116f60f8446aa..760eff27136412fd04c466dd04c8c9c487ccd365 100644
--- a/remoting/webapp/base/js/window_shape.js
+++ b/remoting/webapp/base/js/window_shape.js
@@ -90,8 +90,8 @@ remoting.WindowShape.prototype.centerToDesktop = function(element) {
   var rect = element.getBoundingClientRect();
   var left = (desktop.right - desktop.left - rect.width) / 2 + desktop.left;
   var top = (desktop.bottom - desktop.top - rect.height) / 2 + desktop.top;
-  element.style.left = left + 'px';
-  element.style.top = top + 'px';
+  element.style.left = Math.round(left) + 'px';
+  element.style.top = Math.round(top) + 'px';
   this.updateClientWindowShape();
 };