Fix for perspective GMs and df paths.

Review URL: https://codereview.chromium.org/636933003
diff --git a/src/gpu/GrAADistanceFieldPathRenderer.cpp b/src/gpu/GrAADistanceFieldPathRenderer.cpp
index 364217c..95e4e7a 100755
--- a/src/gpu/GrAADistanceFieldPathRenderer.cpp
+++ b/src/gpu/GrAADistanceFieldPathRenderer.cpp
@@ -267,6 +267,7 @@
     
     GrTexture* texture = fAtlas->getTexture();
     GrDrawState* drawState = target->drawState();
+    GrDrawState::AutoRestoreEffects are(drawState);
     
     SkASSERT(pathData->fPlot);
     GrDrawTarget::DrawToken drawToken = target->getCurrentDrawToken();