Revert of implement readPixels and writePixels natively, w/o using the (deprecated)

Revert of implement readPixels and writePixels natively, w/o using the (deprecated) (https://codereview.chromium.org/199733016/)

Reason for revert:
Android bots segfaulting in tests.

Original issue's description:
> implement readPixels and writePixels natively, w/o using the (deprecated)
> SkCanvas::Config8888 enum.
> 
> Revert "Revert "hide Config8888 entirely". Broke a bunch of builds."
> 
> This reverts commit 763277ba157fef0f651004bb98a189e9f1ac730b.
> 
> Needs chrome to remove the READPIXELS guard from skia's .gyp
> 
> Committed: https://code.google.com/p/skia/source/detail?r=13931

TBR=reed@google.com
NOTREECHECKS=true
NOTRY=true

Committed: http://code.google.com/p/skia/source/detail?r=13932

[mtklein, 2014-03-25 13:38:26]

Created Revert of implement readPixels and writePixels natively, w/o using the
(deprecated)

[commit-bot: I haz the power, 2014-03-25 13:38:29]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/mtklein@google.com/209233004/1

[commit-bot: I haz the power, 2014-03-25 13:38:59]

Change committed as 13932