Merge pull request scala-js#334 from anilanar/window-move-by

Add moveBy to Window

Author: sjrd

src/main/scala/org/scalajs/dom/raw/lib.scala

@@ -3718,6 +3718,13 @@ class CanvasRenderingContext2D extends js.Object {
    */
   def moveTo(x: Double, y: Double): Unit = js.native
 
+  /**
+   * Moves the current window by a specified amount.
+   *
+   * MDN
+   */
+  def moveBy(deltaX: Double, deltaY: Double): Unit = js.native
+
   /**
    * Returns an ImageData object representing the underlying pixel data for the area of
    * the canvas denoted by the rectangle which starts at (sx, sy) and has an sw width and sh