[Fixed Position] Add specs for drop

Add specs related to positioning of objects based on
drop position, WTD-877.

platform/features/layout/src/FixedController.js

@@ -157,6 +157,8 @@ define(
 
             // Position a panel after a drop event
             function handleDrop(e, id, position) {
+                // Ensure that configuration field is populated
+                $scope.configuration = $scope.configuration || {};
                 // Make sure there is a "elements" field in the
                 // view configuration.
                 $scope.configuration.elements =
@@ -173,6 +175,8 @@ define(
                 if ($scope.commit) {
                     $scope.commit("Dropped a frame.");
                 }
+                // Populate template-facing position for this id
+                populatePosition(id);
             }
 
             // Position panes when the model field changes