Start to propagate constness of GrPipelineBuilder up the stack
BUG=skia:
Review URL: https://codereview.chromium.org/1229143007
diff --git a/src/gpu/GrSWMaskHelper.cpp b/src/gpu/GrSWMaskHelper.cpp
index 28071d2..0e0a541 100644
--- a/src/gpu/GrSWMaskHelper.cpp
+++ b/src/gpu/GrSWMaskHelper.cpp
@@ -374,5 +374,5 @@
GrTextureParams::kNone_FilterMode,
kDevice_GrCoordSet))->unref();
- target->drawBWRect(pipelineBuilder, color, SkMatrix::I(), dstRect, NULL, &invert);
+ target->drawBWRect(*pipelineBuilder, color, SkMatrix::I(), dstRect, NULL, &invert);
}