Convert GrClip to an abstract base class

src/effects/SkGpuBlurUtils.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 "SkGpuBlurUtils.h"
 
 #include "SkRect.h"
@@ skipping 194 matching lines @@
         srcRect.offset(srcOffset);
         srcBounds = &localSrcBounds;
     } else {
         srcRect = localDstBounds;
     }
 
     scale_irect_roundout(&srcRect, 1.0f / scaleFactorX, 1.0f / scaleFactorY);
     scale_irect(&srcRect, scaleFactorX, scaleFactorY);
 
     // setup new clip
-    GrClip clip(localDstBounds);
+    GrFixedClip clip(localDstBounds);
 
     sk_sp<GrTexture> srcTexture(sk_ref_sp(origSrc));
 
     SkASSERT(kBGRA_8888_GrPixelConfig == srcTexture->config() ||
              kRGBA_8888_GrPixelConfig == srcTexture->config() ||
              kSRGBA_8888_GrPixelConfig == srcTexture->config() ||
              kSBGRA_8888_GrPixelConfig == srcTexture->config() ||
              kAlpha_8_GrPixelConfig == srcTexture->config());
 
     const int width = dstBounds.width();
@@ skipping 149 matching lines @@
         dstDrawContext.swap(tmpDrawContext);
     }
 
     return srcDrawContext;
 }
 
 }
 
 #endif