Let DFPathRenderer accept smaller paths.

BUG=chromium:682918

Change-Id: Ib5f935a92f967354be696fb24ba874f3602ebdb4
Reviewed-on: https://skia-review.googlesource.com/8601
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
diff --git a/src/gpu/ops/GrAADistanceFieldPathRenderer.cpp b/src/gpu/ops/GrAADistanceFieldPathRenderer.cpp
index 17cd244..0bc356d 100644
--- a/src/gpu/ops/GrAADistanceFieldPathRenderer.cpp
+++ b/src/gpu/ops/GrAADistanceFieldPathRenderer.cpp
@@ -42,7 +42,7 @@
 static const SkScalar kMaxMIP = 162;
 
 static const SkScalar kMaxDim = 73;
-static const SkScalar kMinSize = 8;
+static const SkScalar kMinSize = 4;
 static const SkScalar kMaxSize = 2*kMaxMIP;
 
 // Callback to clear out internal path cache when eviction occurs