Merge pull request #348 from rschamp/get-canvas

Add getter for the renderer's canvas

src/RenderWebGL.js

@@ -201,6 +201,13 @@ class RenderWebGL extends EventEmitter {
         return this._gl;
     }
 
+    /**
+     * @returns {HTMLCanvasElement} the canvas of the WebGL rendering context associated with this renderer.
+     */
+    get canvas () {
+        return this._gl && this._gl.canvas;
+    }
+
     /**
      * Set the physical size of the stage in device-independent pixels.
      * This will be multiplied by the device's pixel ratio on high-DPI displays.