Revert of Enable stencil clipping in mixed sampled render targets

Revert of Enable stencil clipping in mixed sampled render targets (patchset #6 id:100001 of https://codereview.chromium.org/1232103002/ )

Reason for revert:
From Chris: "Co-centered sample locations are not needed to do stencil clip with mixed samples"

Original issue's description:
> Implement stencil clipping in mixed sampled render targets
> 
> This change enables multisampled clipping for mixed sampled
> render targets.  Previously clipping in mixed samples config
> behaved the same as in the gpu config.
> 
> In order to retrofit non-MSAA draw methods, programmable sample
> locations are used in order to colocate all samples at (0.5, 0.5).
> Requires support for NV_sample_locations.
> 
> BUG=skia:4399
> 
> Committed: https://skia.googlesource.com/skia/+/3e77ba96d56d15db30ac6d8ccb900e30aafcbb16

TBR=kkinnunen@nvidia.com,cdalton@nvidia.com,mjk@nvidia.com,markkilgard@gmail.com,vbuzinov@nvidia.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:4399

[bsalomon, 2015-11-10 18:03:19]

Created Revert of Enable stencil clipping in mixed sampled render targets

[commit-bot: I haz the power, 2015-11-10 18:03:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1426993007/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1426993007/1

[commit-bot: I haz the power, 2015-11-10 18:03:36]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-11-10 18:03:37]

Failed to apply patch for include/gpu/GrCaps.h:
While running git apply --index -3 -p1;
  error: patch failed: include/gpu/GrCaps.h:63
  Falling back to three-way merge...
  Applied patch to 'include/gpu/GrCaps.h' with conflicts.
  U include/gpu/GrCaps.h

Patch:       include/gpu/GrCaps.h
Index: include/gpu/GrCaps.h
diff --git a/include/gpu/GrCaps.h b/include/gpu/GrCaps.h
index
0f376f9e5abd157a1088c4bd8fd0814d1ba1c581..248135d691f20fa3d82884a1b8449ee5ff7e5d54
100644
--- a/include/gpu/GrCaps.h
+++ b/include/gpu/GrCaps.h
@@ -63,7 +63,6 @@
     bool dstReadInShaderSupport() const { return fDstReadInShaderSupport; }
     bool dualSourceBlendingSupport() const { return fDualSourceBlendingSupport;
}
     bool mixedSamplesSupport() const { return fMixedSamplesSupport; }
-    bool programmableSampleLocationsSupport() const { return
fProgrammableSampleLocationsSupport; }
 
     /**
     * Get the precision info for a variable of type kFloat_GrSLType,
kVec2f_GrSLType, etc in a
@@ -94,7 +93,6 @@
     bool fDstReadInShaderSupport : 1;
     bool fDualSourceBlendingSupport : 1;
     bool fMixedSamplesSupport : 1;
-    bool fProgrammableSampleLocationsSupport : 1;
 
     bool fShaderPrecisionVaries;
     PrecisionInfo fFloatPrecisions[kGrShaderTypeCount][kGrSLPrecisionCount];

[commit-bot: I haz the power, 2015-11-10 18:03:38]

The CQ bit was unchecked by commit-bot@chromium.org