Tweak distance field path renderer behavior in gamma-correct mode

src/gpu/GrDrawContext.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrBatchTest.h"
 #include "GrColor.h"
 #include "GrDrawContext.h"
@@ skipping 904 matching lines @@
 
     GrPathRenderer::DrawPathArgs args;
     args.fTarget = fDrawContext->getDrawTarget();
     args.fResourceProvider = fDrawContext->fDrawingManager->getContext()->resourceProvider();
     args.fPipelineBuilder = &pipelineBuilder;
     args.fColor = GrColor_WHITE;
     args.fViewMatrix = &viewMatrix;
     args.fPath = &path;
     args.fStroke = &GrStrokeInfo::FillInfo();
     args.fAntiAlias = useCoverageAA;
+    args.fGammaCorrect = fDrawContext->isGammaCorrect();
     pr->drawPath(args);
     return true;
 }
 
 void GrDrawContext::internalDrawPath(const GrClip& clip,
                                      const GrPaint& paint,
                                      const SkMatrix& viewMatrix,
                                      const SkPath& path,
                                      const GrStrokeInfo& strokeInfo) {
     ASSERT_SINGLE_OWNER
@@ skipping 83 matching lines @@
 
     GrPathRenderer::DrawPathArgs args;
     args.fTarget = this->getDrawTarget();
     args.fResourceProvider = fDrawingManager->getContext()->resourceProvider();
     args.fPipelineBuilder = &pipelineBuilder;
     args.fColor = paint.getColor();
     args.fViewMatrix = &viewMatrix;
     args.fPath = pathPtr;
     args.fStroke = strokeInfoPtr;
     args.fAntiAlias = useCoverageAA;
+    args.fGammaCorrect = this->isGammaCorrect();
     pr->drawPath(args);
 }
 
 void GrDrawContext::drawBatch(GrPipelineBuilder* pipelineBuilder, GrDrawBatch* batch) {
     ASSERT_SINGLE_OWNER
     RETURN_IF_ABANDONED
     SkDEBUGCODE(this->validate();)
     GR_AUDIT_TRAIL_AUTO_FRAME(fAuditTrail, "GrDrawContext::drawBatch");
 
     this->getDrawTarget()->drawBatch(*pipelineBuilder, batch);
 }