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

gm/simpleaaclip.cpp

 /*
  * Copyright 2012 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 "SkAAClip.h"
 #include "SkCanvas.h"
@@ skipping 88 matching lines @@
 
     void drawPathsOped(SkCanvas* canvas, SkCanvas::ClipOp op, SkColor color) {
 
         this->drawOrig(canvas);
 
         canvas->save();
 
         // create the clip mask with the supplied boolean op
         if (kPath_GeomType == fGeomType) {
             // path-based case
-            canvas->clipPath(fBasePath, SkCanvas::kReplace_Op, true);
+            canvas->clipPath(fBasePath, true);
             canvas->clipPath(fRectPath, op, true);
         } else {
             // rect-based case
-            canvas->clipRect(fBase, SkCanvas::kReplace_Op, true);
+            canvas->clipRect(fBase, true);
             canvas->clipRect(fRect, op, true);
         }
 
         // draw a rect that will entirely cover the clip mask area
         SkPaint paint;
         paint.setColor(color);
 
         SkRect r = SkRect::MakeLTRB(SkIntToScalar(90),  SkIntToScalar(90),
                                     SkIntToScalar(180), SkIntToScalar(180));
 
@@ skipping 70 matching lines @@
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 // rects
 DEF_GM( return new SimpleClipGM(SimpleClipGM::kRect_GeomType); )
 DEF_GM( return new SimpleClipGM(SimpleClipGM::kPath_GeomType); )
 DEF_GM( return new SimpleClipGM(SimpleClipGM::kAAClip_GeomType); )
 
 }