Revert of Revert ""Revert of eliminate config param -- it was always self's config (https://codereview.chromi… (https://codereview.chromium.org/291163005/)

Reason for revert:
broke 6 webgl/canvas tests in blink (don't know why yet)

https://storage.googleapis.com/chromium-layout-test-archives/WebKit_Mac10_7/27348/layout-test-results/results.html


Original issue's description:
> Revert ""Revert of eliminate config param -- it was always self's config (https://codereview.chromium.org/246513002/)"""
>
> This reverts commit 3dbceb4f8283b2fb1728d0daf010d036099a2eae.
>
> BUG=skia:
>
> Committed: http://code.google.com/p/skia/source/detail?r=14806

R=bsalomon@google.com, robertphillips@google.com
TBR=bsalomon@google.com, robertphillips@google.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Author: reed@google.com

Review URL: https://codereview.chromium.org/295093003

git-svn-id: http://skia.googlecode.com/svn/trunk@14826 2bbb7eff-a529-9590-31e7-b0007b416f81