Revert[2] "remove SK_SUPPORT_LEGACY_CLIP_REGIONOPS"

This reverts commit a129dfef2aaab0b5995cdf1ab7b2cdd41c29cf72.

BUG=skia:

Change-Id: I717de6e5fcd4516aa684b014b1414b0f82ac2b91
Reviewed-on: https://skia-review.googlesource.com/5722
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Derek Sollenberger <djsollen@google.com>
diff --git a/samplecode/SampleApp.cpp b/samplecode/SampleApp.cpp
index 776844c..1acd975 100644
--- a/samplecode/SampleApp.cpp
+++ b/samplecode/SampleApp.cpp
@@ -1370,7 +1370,7 @@
 
     if (fUseClip) {
         canvas->drawColor(0xFFFF88FF);
-        canvas->clipPath(fClipPath, SkCanvas::kIntersect_Op, true);
+        canvas->clipPath(fClipPath, kIntersect_SkClipOp, true);
     }
 
     // Install a flags filter proxy canvas if needed