[Fixed Position] Begin updating controller

Begin updating controller to expose handles for dragging,
resizing elements in fixed position view. WTD-882.

platform/features/layout/src/FixedDragHandle.js

@@ -0,0 +1,52 @@
+/*global define*/
+
+define(
+    [],
+    function () {
+        'use strict';
+
+
+        // 8 by 8 pixels
+        var DRAG_HANDLE_SIZE = [ 8, 8 ];
+
+        /**
+         * Template-displayable drag handle for an element in fixed
+         * position mode.
+         * @constructor
+         */
+        function FixedDragHandle(elementHandle, gridSize, commit) {
+            var self = {};
+
+            function getStyle() {
+                // Adjust from grid to pixel coordinates
+                var x = elementHandle.x() * gridSize[0],
+                    y = elementHandle.y() * gridSize[1];
+
+                // Convert to a CSS style centered on that point
+                return {
+                    left: (x - DRAG_HANDLE_SIZE[0] / 2) + 'px',
+                    right: (x - DRAG_HANDLE_SIZE[1] / 2) + 'px',
+                    width: DRAG_HANDLE_SIZE[0] + 'px',
+                    height: DRAG_HANDLE_SIZE[1] + 'px'
+                };
+            }
+
+            function noop() {
+
+            }
+
+            return {
+                /**
+                 * Get a CSS style to position this drag handle.
+                 * @returns CSS style object (for `ng-style`)
+                 */
+                style: getStyle,
+                startDrag: noop,
+                continueDrag: noop,
+                endDrag: noop
+            };
+        }
+
+        return FixedDragHandle;
+    }
+);