Convert GrClip to an abstract base class

gm/texdata.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 // This test only works with the GPU backend.
 
 #include "gm.h"
@@ skipping 64 matching lines @@
         desc.fHeight    = 2 * S;
         GrTexture* texture = context->textureProvider()->createTexture(
             desc, SkBudgeted::kNo, gTextureData.get(), 0);
 
         if (!texture) {
             return;
         }
         SkAutoTUnref<GrTexture> au(texture);
 
         // setup new clip
-        GrClip clip(SkRect::MakeWH(2*S, 2*S));
+        GrFixedClip clip(SkIRect::MakeWH(2*S, 2*S));
 
         GrPaint paint;
         paint.setPorterDuffXPFactory(SkXfermode::kSrcOver_Mode);
 
         SkMatrix vm;
         if (i) {
             vm.setRotate(90 * SK_Scalar1,
                             S * SK_Scalar1,
                             S * SK_Scalar1);
         } else {
@@ skipping 16 matching lines @@
             }
         }
         texture->writePixels(S, (i ? 0 : S), S, S,
                                 texture->config(), gTextureData.get(),
                                 4 * stride);
         drawContext->drawRect(clip, paint, vm, SkRect::MakeWH(2*S, 2*S));
     }
 }
 #endif