Update IPathObject to include properties (#3822)

* Update IPathObject to include properties

* Fix ipathobject svgpath

core/renderers/common/i_path_object.js

@@ -27,6 +27,38 @@ goog.requireType('Blockly.Theme');
  */
 Blockly.blockRendering.IPathObject = function(_root, _constants) {};
 
+/**
+ * The primary path of the block.
+ * @type {!SVGElement}
+ */
+Blockly.blockRendering.IPathObject.prototype.svgPath;
+
+/**
+ * The renderer's constant provider.
+ * @type {!Blockly.blockRendering.ConstantProvider}
+ */
+Blockly.blockRendering.IPathObject.prototype.constants;
+
+/**
+ * The primary path of the block.
+ * @type {!Blockly.Theme.BlockStyle}
+ */
+Blockly.blockRendering.IPathObject.prototype.style;
+
+/**
+ * Holds the cursors svg element when the cursor is attached to the block.
+ * This is null if there is no cursor on the block.
+ * @type {SVGElement}
+ */
+Blockly.blockRendering.IPathObject.prototype.cursorSvg;
+
+/**
+ * Holds the markers svg element when the marker is attached to the block.
+ * This is null if there is no marker on the block.
+ * @type {SVGElement}
+ */
+Blockly.blockRendering.IPathObject.prototype.markerSvg;
+
 /**
  * Set the path generated by the renderer onto the respective SVG element.
  * @param {string} pathString The path.

core/renderers/common/path_object.js

@@ -43,7 +43,7 @@ Blockly.blockRendering.PathObject = function(root, style, constants) {
 
   /**
    * The primary path of the block.
-   * @type {SVGElement}
+   * @type {!SVGElement}
    * @package
    */
   this.svgPath = Blockly.utils.dom.createSvgElement('path',

core/renderers/geras/path_object.js

@@ -54,7 +54,7 @@ Blockly.geras.PathObject = function(root, style, constants) {
 
   /**
    * The primary path of the block.
-   * @type {SVGElement}
+   * @type {!SVGElement}
    * @package
    */
   this.svgPath = Blockly.utils.dom.createSvgElement('path',