allow clip calls w/o op param, remove unnecessary kReplace ops

gm/pathopsinverse.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 #include "SkBitmap.h"
 #include "SkPath.h"
@@ skipping 57 matching lines @@
                 SkPath::FillType twoF = twoFill ? SkPath::kInverseEvenOdd_FillType
                         : SkPath::kEvenOdd_FillType;
                 one.reset();
                 one.setFillType(oneF);
                 one.addRect(10, 10, 70, 70);
                 two.reset();
                 two.setFillType(twoF);
                 two.addRect(40, 40, 100, 100);
                 canvas->save();
                 canvas->translate(0, SkIntToScalar(yPos));
-                canvas->clipRect(SkRect::MakeWH(110, 110), SkCanvas::kIntersect_Op, true);
+                canvas->clipRect(SkRect::MakeWH(110, 110), true);
                 canvas->drawPath(one, fOnePaint);
                 canvas->drawPath(one, fOutlinePaint);
                 canvas->drawPath(two, fTwoPaint);
                 canvas->drawPath(two, fOutlinePaint);
                 canvas->restore();
                 int xPos = 150;
                 for (int op = kDifference_SkPathOp; op <= kReverseDifference_SkPathOp; ++op) {
                     SkPath result;
                     Op(one, two, (SkPathOp) op, &result);
                     canvas->save();
                     canvas->translate(SkIntToScalar(xPos), SkIntToScalar(yPos));
-                    canvas->clipRect(SkRect::MakeWH(110, 110), SkCanvas::kIntersect_Op, true);
+                    canvas->clipRect(SkRect::MakeWH(110, 110), true);
                     canvas->drawPath(result, fOpPaint[op]);
                     canvas->drawPath(result, fOutlinePaint);
                     canvas->restore();
                     xPos += 150;
                 }
                 yPos += 150;
             }
         }
     }
 
 private:
     SkPaint fOnePaint;
     SkPaint fTwoPaint;
     SkPaint fOutlinePaint;
     SkPaint fOpPaint[kReverseDifference_SkPathOp - kDifference_SkPathOp + 1];
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static GM* MyFactory(void*) { return new PathOpsInverseGM; }
 static GMRegistry reg(MyFactory);
 
 }