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/SampleIdentityScale.cpp b/samplecode/SampleIdentityScale.cpp
index 8d1bc36..ae6092a 100644
--- a/samplecode/SampleIdentityScale.cpp
+++ b/samplecode/SampleIdentityScale.cpp
@@ -65,7 +65,7 @@
           SkRect r = { 100, 100, 356, 356 };
           SkPath clipPath;
           clipPath.addRoundRect(r, SkIntToScalar(5), SkIntToScalar(5));
-          canvas->clipPath(clipPath, SkCanvas::kIntersect_Op, SkToBool(1));
+          canvas->clipPath(clipPath, kIntersect_SkClipOp, true);
           text = "Scaled = 0";
         }
         canvas->drawBitmap( fBM, 100, 100, &paint );