Add an opaqueness hint to GrDrawState.

src/gpu/GrDrawTarget.cpp

Index: src/gpu/GrDrawTarget.cpp
diff --git a/src/gpu/GrDrawTarget.cpp b/src/gpu/GrDrawTarget.cpp
index f8bb910cd85d4073f84e0b4b4aeb9527f858f876..2d27859c3ee5fd61aef50ac5e64300e2dc66ac09 100644
--- a/src/gpu/GrDrawTarget.cpp
+++ b/src/gpu/GrDrawTarget.cpp
@@ -13,6 +13,7 @@
 #include "GrDrawTargetCaps.h"
 #include "GrPath.h"
 #include "GrRenderTarget.h"
+#include "GrTemplates.h"
 #include "GrTexture.h"
 #include "GrVertexBuffer.h"
 
@@ -613,21 +614,6 @@ void GrDrawTarget::removeGpuTraceMarker(const GrGpuTraceMarker* marker) {
 
 ////////////////////////////////////////////////////////////////////////////////
 
-bool GrDrawTarget::canApplyCoverage() const {
-    // we can correctly apply coverage if a) we have dual source blending
-    // or b) one of our blend optimizations applies
-    // or c) the src, dst blend coeffs are 1,0 and we will read Dst Color
-    GrBlendCoeff srcCoeff;
-    GrBlendCoeff dstCoeff;
-    GrDrawState::BlendOptFlags flag = this->getDrawState().getBlendOpts(true, &srcCoeff, &dstCoeff);
-    return this->caps()->dualSourceBlendingSupport() ||
-           GrDrawState::kNone_BlendOpt != flag ||
-           (this->getDrawState().willEffectReadDstColor() &&
-            kOne_GrBlendCoeff == srcCoeff && kZero_GrBlendCoeff == dstCoeff);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
 void GrDrawTarget::drawIndexedInstances(GrPrimitiveType type,
                                         int instanceCount,
                                         int verticesPerInstance,