Make GrRenderTarget[(Proxy)|(Context)]? advertise a "full scene aa type".

Bug: skia:
Change-Id: I24549604e8305028e34e0022bfef992a8e8c33f7
Reviewed-on: https://skia-review.googlesource.com/16230
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/effects/GrCoverageSetOpXP.cpp b/src/gpu/effects/GrCoverageSetOpXP.cpp
index e75a588..344762d 100644
--- a/src/gpu/effects/GrCoverageSetOpXP.cpp
+++ b/src/gpu/effects/GrCoverageSetOpXP.cpp
@@ -228,7 +228,8 @@
 #if GR_TEST_UTILS
 const GrXPFactory* GrCoverageSetOpXPFactory::TestGet(GrProcessorTestData* d) {
     SkRegion::Op regionOp = SkRegion::Op(d->fRandom->nextULessThan(SkRegion::kLastOp + 1));
-    bool invertCoverage = !d->fRenderTargetContext->hasMixedSamples() && d->fRandom->nextBool();
+    bool isMixedSamples = GrFSAAType::kMixedSamples == d->fRenderTargetContext->fsaaType();
+    bool invertCoverage = !isMixedSamples && d->fRandom->nextBool();
     return GrCoverageSetOpXPFactory::Get(regionOp, invertCoverage);
 }
 #endif