Convert GrClip to an abstract base class

src/gpu/SkGpuDevice.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.
  */
 
 #include "SkGpuDevice.h"
 
 #include "GrBlurUtils.h"
@@ skipping 323 matching lines @@
 }
 
 // call this every draw call, to ensure that the context reflects our state,
 // and not the state from some other canvas/device
 void SkGpuDevice::prepareDraw(const SkDraw& draw) {
     ASSERT_SINGLE_OWNER
     SkASSERT(fClipStack.get());
 
     SkASSERT(draw.fClipStack && draw.fClipStack == fClipStack);
 
-    fClip.setClipStack(fClipStack, &this->getOrigin());
+    fClip.reset(fClipStack, &this->getOrigin());
 }
 
 GrRenderTarget* SkGpuDevice::accessRenderTarget() {
     ASSERT_SINGLE_OWNER
     return fRenderTarget;
 }
 
 GrDrawContext* SkGpuDevice::accessDrawContext() {
     ASSERT_SINGLE_OWNER
     return fDrawContext.get();
@@ skipping 1492 matching lines @@
 }
 
 SkImageFilterCache* SkGpuDevice::getImageFilterCache() {
     ASSERT_SINGLE_OWNER
     // We always return a transient cache, so it is freed after each
     // filter traversal.
     return SkImageFilterCache::Create(kDefaultImageFilterCacheSize);
 }
 
 #endif