Tweak distance field path renderer behavior in gamma-correct mode

src/gpu/GrDrawContext.cpp

Index: src/gpu/GrDrawContext.cpp
diff --git a/src/gpu/GrDrawContext.cpp b/src/gpu/GrDrawContext.cpp
index 9110b34d6f38be969a62d637fedbed0e8e28f36e..2e4b13f03ee0e87f5f1e75b2d2e8758d96660801 100644
--- a/src/gpu/GrDrawContext.cpp
+++ b/src/gpu/GrDrawContext.cpp
@@ -922,6 +922,7 @@ bool GrDrawContextPriv::drawAndStencilPath(const SkIRect* scissorRect,
     args.fPath = &path;
     args.fStroke = &GrStrokeInfo::FillInfo();
     args.fAntiAlias = useCoverageAA;
+    args.fGammaCorrect = fDrawContext->isGammaCorrect();
     pr->drawPath(args);
     return true;
 }
@@ -1025,6 +1026,7 @@ void GrDrawContext::internalDrawPath(const GrClip& clip,
     args.fPath = pathPtr;
     args.fStroke = strokeInfoPtr;
     args.fAntiAlias = useCoverageAA;
+    args.fGammaCorrect = this->isGammaCorrect();
     pr->drawPath(args);
 }