Chris Craik 80d2ade939 Overdraw avoidance in new pipeline
bug:27873093

Adds the simple overdraw avoidance optimization to the new
pipeline. This means when LayerBuilder defers draws that are opaque over
the full area of the repaint region, it will discard all drawing content
beneth.

Also moves a lot of complexity out of BakedOpState's header.

Change-Id: Iffca6d8e1b170ef31a5d6c83d25592670e02323d
2016-03-29 13:30:15 -07:00
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