Add getTransform() to canvas context extern (see https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/getTransform).
@@ -489,6 +489,11 @@ BaseRenderingContext2D.prototype.transform = function(
BaseRenderingContext2D.prototype.setTransform = function(
m11, m12, m21, m22, dx, dy) {};
+/**
+ * @return {!DOMMatrixReadOnly}
+ */
+BaseRenderingContext2D.prototype.getTransform = function() {};
+
/**
* @param {number} x0
* @param {number} y0
