i suppose it's a bug . in majority of widgets constructor with Element
argument is protected.
even a comment in source code of canvas it should be protected not
private:

  /**
   * Protected constructor. Use {@link #createIfSupported()} to create
a Canvas.
   */
  private Canvas(CanvasElement element) {
    setElement(element);
  }

i think you should raise the issue in gwt-contributors group.

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