correctly copy constant coverage from GrPaint to GrDrawState

src/gpu/GrDrawState.cpp

Index: src/gpu/GrDrawState.cpp
diff --git a/src/gpu/GrDrawState.cpp b/src/gpu/GrDrawState.cpp
index ab800d24e7c1c74268a02312caec8dc3d7b65d4a..0a567573cb8aa758bfc0dad361449c8229eb1be1 100644
--- a/src/gpu/GrDrawState.cpp
+++ b/src/gpu/GrDrawState.cpp
@@ -46,7 +46,6 @@ void GrDrawState::setFromPaint(const GrPaint& paint, const SkMatrix& vm, GrRende
 
     // These have no equivalent in GrPaint, set them to defaults
     fCommon.fBlendConstant = 0x0;
-    fCommon.fCoverage = 0xffffffff;
     fCommon.fDrawFace = kBoth_DrawFace;
     fCommon.fStencilSettings.setDisabled();
     this->resetStateFlags();
@@ -55,6 +54,7 @@ void GrDrawState::setFromPaint(const GrPaint& paint, const SkMatrix& vm, GrRende
     this->enableState(GrDrawState::kClip_StateBit);
 
     this->setColor(paint.getColor());
+    this->setCoverage4(paint.getCoverage());
     this->setState(GrDrawState::kDither_StateBit, paint.isDither());
     this->setState(GrDrawState::kHWAntialias_StateBit, paint.isAntiAlias());