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

gm/complexclip3.cpp

 /*
  * Copyright 2014 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 "SkCanvas.h"
 #include "SkPath.h"
 
@@ skipping 66 matching lines @@
                         bool doAAA = SkToBool(aaBits & 1);
                         bool doAAB = SkToBool(aaBits & 2);
                         bool doInvA = SkToBool(invA);
                         bool doInvB = SkToBool(invB);
                         canvas->save();
                         // set clip
                         firstClip->setFillType(doInvA ? SkPath::kInverseEvenOdd_FillType :
                                                SkPath::kEvenOdd_FillType);
                         secondClip->setFillType(doInvB ? SkPath::kInverseEvenOdd_FillType :
                                                 SkPath::kEvenOdd_FillType);
-                        canvas->clipPath(*firstClip, SkCanvas::kIntersect_Op, doAAA);
+                        canvas->clipPath(*firstClip, doAAA);
                         canvas->clipPath(*secondClip, gOps[op].fOp, doAAB);
 
                         // draw rect clipped
                         SkRect r = { 0, 0, 100, 100 };
                         canvas->drawRect(r, pathPaint);
                         canvas->restore();
 
 
                         SkScalar txtX = SkIntToScalar(10);
                         paint.setColor(SK_ColorBLACK);
@@ skipping 25 matching lines @@
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 // Simple clip first
 DEF_GM( return new ComplexClip3GM(true); )
 // Complex clip first
 DEF_GM( return new ComplexClip3GM(false); )
 }