Updated workaround for Intel 6xxx clear to 0/1 bug

Updated workaround for Intel 6xxx clear to 0/1 bug

The previous workaround only handled the glClearColor(0,0,0,1) case,
it turns out we need to work around any glClearColor made up of entirely
0s and 1s.

R=bsalomon@google.com
Bug: 710443
Change-Id: I78a75559fc11811ad9a218436231354d66d2ad51
Reviewed-on: https://skia-review.googlesource.com/17327
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Eric Karl <ericrk@chromium.org>

Workaround for Intel 6xxx clear to opaque black bug
NOTREECHECKS=true
NOTRY=true
NOPRESUBMIT=true
Bug: skia:
Change-Id: Id5e29b483c2b6f698219abfc5bbb2d858c4fc117
Reviewed-On: https://skia-review.googlesource.com/16427
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-By: Brian Osman <brianosman@google.com>
Reviewed-on: https://skia-review.googlesource.com/17790
Reviewed-by: Brian Salomon <bsalomon@google.com>