Revert of Initial picture shader implementation (https://codereview.chromium.org...

Revert of Initial picture shader implementation (https://codereview.chromium.org/221923007/)

Reason for revert:
breaking the buildbots. Subsequent CL only addressed CompareGMs but GenerateGMs are also failing.

Original issue's description:
> Initial picture shader implementation
>
> This CL adds an SkPictureShader class to support SkPicture-based
> patterns.
>
> The implementation renders the picture into an SkBitmap tile and then
> delegates to SkBitmapProcShader for the actual operation.
>
> R=reed@google.com,robertphillips@google.com,bsalomon@google.com
>
> Committed: http://code.google.com/p/skia/source/detail?r=14085

R=bsalomon@google.com, reed@google.com, robertphillips@google.com, fmalita@chromium.org
TBR=bsalomon@google.com, fmalita@chromium.org, reed@google.com, robertphillips@google.com
NOTREECHECKS=true
NOTRY=true

Author: bensong@google.com

Review URL: https://codereview.chromium.org/227553010

git-svn-id: http://skia.googlecode.com/svn/trunk@14087 2bbb7eff-a529-9590-31e7-b0007b416f81