Fix GenericDraweeView apply Fade.OUT transition without effect

[b7woreo]

Motivation (required)

Fix GenericDraweeView apply Fade.OUT transition without effect discuss in #2388

Test Plan (required)

Visiable can not impact behavior of drawable, so comfirm plachholder can draw whether top level drawable is visiable.

  public void testDrawDrawableWhetherVisible() {
    GenericDraweeHierarchy dh = mBuilder
        .setPlaceholderImage(mPlaceholderImage)
        .build();
    Canvas mockCanvas = mock(Canvas.class);
    dh.getTopLevelDrawable().setVisible(false, true);
    dh.getTopLevelDrawable().draw(mockCanvas);
    verify(mPlaceholderImage, times(1)).draw(mockCanvas);
    dh.getTopLevelDrawable().setVisible(true, true);
    dh.getTopLevelDrawable().draw(mockCanvas);
    verify(mPlaceholderImage,times(2)).draw(mockCanvas);
  }

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@oprisnik has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[oprisnik]

Thanks for the pull request. We are working on new image components (see VitoView) and are not merging Drawee changes. Can you verify if VitoView works? There is no public Maven artifact yet, but you can build from the repository.