stop using exotic clipops

cc/proto/skia_conversions.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/proto/skia_conversions.h"
 
 #include "base/logging.h"
 #include "cc/proto/gfx_conversions.h"
 #include "cc/proto/skclipop.pb.h"
 #include "cc/proto/skrrect.pb.h"
@@ skipping 14 matching lines @@
 }
 
 }  // namespace
 
 SkClipOp SkClipOpFromProto(proto::SkClipOp::Op op) {
   switch (op) {
     case proto::SkClipOp::DIFFERENCE_:
       return SkClipOp::kDifference;
     case proto::SkClipOp::INTERSECT:
       return SkClipOp::kIntersect;
-    case proto::SkClipOp::UNION:
-      return SkClipOp::kUnion;
-    case proto::SkClipOp::XOR:
-      return SkClipOp::kXOR;
-    case proto::SkClipOp::REVERSE_DIFFERENCE:
-      return SkClipOp::kReverseDifference;
-    case proto::SkClipOp::REPLACE:
-      return SkClipOp::kReplace;
+    default:
+      break;
   }
   return SkClipOp::kDifference;
 }
 
 proto::SkClipOp::Op SkClipOpToProto(SkClipOp op) {
   switch (op) {
     case SkClipOp::kDifference:
       return proto::SkClipOp::DIFFERENCE_;
     case SkClipOp::kIntersect:
       return proto::SkClipOp::INTERSECT;
-    case SkClipOp::kUnion:
-      return proto::SkClipOp::UNION;
-    case SkClipOp::kXOR:
-      return proto::SkClipOp::XOR;
-    case SkClipOp::kReverseDifference:
-      return proto::SkClipOp::REVERSE_DIFFERENCE;
-    case SkClipOp::kReplace:
-      return proto::SkClipOp::REPLACE;
+    default:
+      break;
   }
   return proto::SkClipOp::DIFFERENCE_;
 }
 
 SkBlendMode SkXfermodeModeFromProto(proto::SkXfermode::Mode mode) {
   switch (mode) {
     case proto::SkXfermode::CLEAR_:
       return SkBlendMode::kClear;
     case proto::SkXfermode::SRC:
       return SkBlendMode::kSrc;
@@ skipping 142 matching lines @@
   parsed_radii[SkRRect::kLowerRight_Corner] =
       ProtoToSkPoint(proto.radii_lower_right());
   parsed_radii[SkRRect::kLowerLeft_Corner] =
       ProtoToSkPoint(proto.radii_lower_left());
   SkRRect rect;
   rect.setRectRadii(parsed_rect, parsed_radii);
   return rect;
 }
 
 }  // namespace cc