DO NOT MERGE Change the logic of ContainerLayer's isVisible()

The original logic of ContainerLayer's isVisible() checks the hidden flag.
Therefore, SurfaceFlinger thought that those abstract surfaces have to
show in display. However, they are meaningless for frame content. They
should be ignored by SurfaceFlinger, so we can safely return false.

Test: Change the type of abstract surface to ContainerLayer. Then slide
      UI, play video and so on.
Bug: 111164627
Change-Id: I09e8647dc7fd8578d28dd79f3428a5e2eeb822fe