use SkClipOps instead of (deprecated) SkRegion ops

Source/platform/graphics/GraphicsContext.h

Index: Source/platform/graphics/GraphicsContext.h
diff --git a/Source/platform/graphics/GraphicsContext.h b/Source/platform/graphics/GraphicsContext.h
index 2fa7c531a00ca76da8cc5da5a64d6d8fda21e75e..afda270b92c5cda217235d5981eb3f08a7ada146 100644
--- a/Source/platform/graphics/GraphicsContext.h
+++ b/Source/platform/graphics/GraphicsContext.h
@@ -290,14 +290,14 @@ public:
 
     void clip(const IntRect& rect) { clipRect(rect); }
     void clip(const FloatRect& rect) { clipRect(rect); }
-    void clipRoundedRect(const RoundedRect&, SkRegion::Op = SkRegion::kIntersect_Op);
-    void clipOut(const IntRect& rect) { clipRect(rect, NotAntiAliased, SkRegion::kDifference_Op); }
+    void clipRoundedRect(const RoundedRect&, SkClipOp = kIntersect_SkClipOp);
+    void clipOut(const IntRect& rect) { clipRect(rect, NotAntiAliased, kDifference_SkClipOp); }
     void clipOut(const Path&);
     void clipOutRoundedRect(const RoundedRect&);
     void clipPath(const Path&, WindRule = RULE_EVENODD, AntiAliasingMode = AntiAliased);
-    void clipPath(const SkPath&, AntiAliasingMode = NotAntiAliased, SkRegion::Op = SkRegion::kIntersect_Op);
+    void clipPath(const SkPath&, AntiAliasingMode = NotAntiAliased, SkClipOp = kIntersect_SkClipOp);
     void clipPolygon(size_t numPoints, const FloatPoint*, bool antialias);
-    void clipRect(const SkRect&, AntiAliasingMode = NotAntiAliased, SkRegion::Op = SkRegion::kIntersect_Op);
+    void clipRect(const SkRect&, AntiAliasingMode = NotAntiAliased, SkClipOp = kIntersect_SkClipOp);
 
     void drawText(const Font&, const TextRunPaintInfo&, const FloatPoint&);
     void drawEmphasisMarks(const Font&, const TextRunPaintInfo&, const AtomicString& mark, const FloatPoint&);
@@ -428,7 +428,7 @@ private:
     void drawFocusRingRect(const SkRect&, const Color&, int width);
 
     // SkCanvas wrappers.
-    void clipRRect(const SkRRect&, AntiAliasingMode = NotAntiAliased, SkRegion::Op = SkRegion::kIntersect_Op);
+    void clipRRect(const SkRRect&, AntiAliasingMode = NotAntiAliased, SkClipOp = kIntersect_SkClipOp);
     void concat(const SkMatrix&);
     void drawRRect(const SkRRect&, const SkPaint&);