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If the SurfaceCache discards our frames on another thread, the runnable that notifies us of that discard could race with a decode complete notification. So we can't rely on any ordering of SetDiscarded and NotifyDecodeComplete. Thus we must derive our state purely from the SurfaceCache (and mAnimationFinished from RasterImage). We also update the image state in RequestRefresh (the main place where we use the state that is updated). The other main place we use the state is GetCompositedFrame, but we don't update the state there. It should be fine because the only time this might lag behind reality is if the frames are discarded, and it should be fine to continue drawing the composited frame until the discard notification arrives. The way that we tell that an animated image has all of its frames complete in the surface cache is less than ideal.