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/gm/complexclip.cpp b/gm/complexclip.cpp
index 2f8fa3d..2ae6a08 100644
--- a/gm/complexclip.cpp
+++ b/gm/complexclip.cpp
@@ -86,14 +86,14 @@
         paint.setTextSize(SkIntToScalar(20));
 
         constexpr struct {
-            SkCanvas::ClipOp fOp;
+            SkClipOp fOp;
             const char*      fName;
         } gOps[] = { //extra spaces in names for measureText
-            {SkCanvas::kIntersect_Op,         "Isect "},
-            {SkCanvas::kDifference_Op,        "Diff " },
-            {SkCanvas::kUnion_Op,             "Union "},
-            {SkCanvas::kXOR_Op,               "Xor "  },
-            {SkCanvas::kReverseDifference_Op, "RDiff "}
+            {kIntersect_SkClipOp,         "Isect "},
+            {kDifference_SkClipOp,        "Diff " },
+            {kUnion_SkClipOp,             "Union "},
+            {kXOR_SkClipOp,               "Xor "  },
+            {kReverseDifference_SkClipOp, "RDiff "}
         };
 
         canvas->translate(SkIntToScalar(20), SkIntToScalar(20));