Ojan Vafai 6ee8440f27 Walk render tree instead of render layers for paint.
This is the first step of getting rid of RenderLayer.
Instead of walking the RenderLayer tree, wall the RenderObject
tree and add any layers encountered to a vector to paint later.

This patch just consolidates and move the code from RenderLayer
to RenderBox and then changes the children painting to
iterate over the vector. Therefore we walk the RenderObject tree.
We still call out to RenderLayer in a bunch of places.
A followup patch will get rid of those.

R=esprehn@chromium.org

Review URL: https://codereview.chromium.org/899753003
2015-02-06 11:38:25 +11:00
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