1095783 - Always store retained data for frames that contain images, even if the image is not yet decoded

Status: NEW

(Core :: Layout, defect)

Description

[Seth Fowler [:seth] [:s2h]]

We'd like to be able to check if a frame is visible by testing whether it has retained data stored - in other words, whether it has a mapping to a layer. This currently almost works (and we use it in ImageLoader) except that frames that don't draw anything because the associated image isn't decoded don't get retained data. We should fix this so that this can be a reliable visibility test.