Fix GrCoverageSetOpXP unit test on mixed samples

src/gpu/effects/GrCoverageSetOpXP.cpp

Index: src/gpu/effects/GrCoverageSetOpXP.cpp
diff --git a/src/gpu/effects/GrCoverageSetOpXP.cpp b/src/gpu/effects/GrCoverageSetOpXP.cpp
index 5c876d5cff959334bc9cc94d6ea0d5a7c98e0295..126a6394277e0ec27e9b52961509b7870f95b650 100644
--- a/src/gpu/effects/GrCoverageSetOpXP.cpp
+++ b/src/gpu/effects/GrCoverageSetOpXP.cpp
@@ -247,7 +247,7 @@ GR_DEFINE_XP_FACTORY_TEST(GrCoverageSetOpXPFactory);
 
 const GrXPFactory* GrCoverageSetOpXPFactory::TestCreate(GrProcessorTestData* d) {
     SkRegion::Op regionOp = SkRegion::Op(d->fRandom->nextULessThan(SkRegion::kLastOp + 1));
-    bool invertCoverage = d->fRandom->nextBool();
+    bool invertCoverage = !d->fRenderTarget->hasMixedSamples() && d->fRandom->nextBool();

[bsalomon, 2015/11/12 21:08:28]

Can you add a comment here about why?

     return GrCoverageSetOpXPFactory::Create(regionOp, invertCoverage);
 }