At least Skia and OpenGL use POST_PAINT priority for flushing drawn contents to the screen. Using the higher REPAINT priority here could mean that actually showing the contents would not happen. Also, at least with Skia+Vulkan, it seems that Skia could queue commands indefinitely, eventually running out of resources. Change-Id: Ia3969bad18d710b006325a0fba11dc318ff93786