Fixes: 28125010
Restructures 'scene defer', to implement window backdrop overdraw
avoidance in new render pipeline, and disable clipping to content draw
bounds.
Also restructures FrameBuilder's constructors, to separate out into
multiple defer methods.
Change-Id: I53facb904c1a4a4acc493d8a489921a79a50494e
Skia's SkCanvas::SaveFlags are being deprecated. This CL introduces
the equivalent android::SaveFlags, converts all internal clients to
the new enum, and switches the saveLayer glue to the
SaveLayerRec-based API.
Change-Id: Icb1785f4e7c0f652b1f04b34a1e3ccb063c408f3
