Reland "Revert "Use flat version of path-direction enum""

This reverts commit 1792b19485cacb0c950a3c0ea0aab763a8d43176.

Reason for revert: need to update legacy_convexity, still used by google3

Original change's description:
> Revert "Revert "Use flat version of path-direction enum""
> 
> This reverts commit 0dacc6b7d3027e8181311a61f7ca798be52a0250.
> 
> Change-Id: Ie103e9f36b07e4ee256a3688a4decf3a6dd74314
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/255832
> Auto-Submit: Mike Reed <reed@google.com>
> Reviewed-by: Mike Reed <reed@google.com>
> Commit-Queue: Mike Reed <reed@google.com>

TBR=reed@google.com

Change-Id: I0ecea0eb8a237298c6b908cc4bfd1cacdfc5b900
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/255976
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/samplecode/SampleRegion.cpp b/samplecode/SampleRegion.cpp
index 7c16c01..58ad5e0 100644
--- a/samplecode/SampleRegion.cpp
+++ b/samplecode/SampleRegion.cpp
@@ -32,7 +32,7 @@
     SkPath path;
     path.addRect(0.0f, 0.0f,
                  SkIntToScalar(width), SkIntToScalar(height),
-                 SkPathDirection::kCW);
+                 SkPath::kCW_Direction);
     SkRect r = SkRect::MakeWH(SkIntToScalar(width), SkIntToScalar(height));
 
     SkCanvas c(bitmap);