[WIP] CHG: [droi;amc] switch to standard surface rendering #7689
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This switches mediacodec to rendering directly to a droid Surface, with going thru EGL, leaving composition to the OS.
It should improves performances and compatibility, and allow to have different resolutions for GUI and video (if properly implemented by the firmware), beyond the fact that it's the per-design way to use mediacodec.
NOTE: the first 4 commits are #7046 , on which this one is based