Convert GrClip to an abstract base class

src/gpu/GrTextureToYUVPlanes.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrTextureToYUVPlanes.h"
 #include "effects/GrSimpleTextureEffect.h"
 #include "effects/GrYUVEffect.h"
@@ skipping 25 matching lines @@
     if (!fp) {
         return false;
     }
     fp.reset(proc(fp, colorSpace));
     if (!fp) {
         return false;
     }
     GrPaint paint;
     paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
     paint.addColorFragmentProcessor(fp);
-    dst->drawRect(GrClip::WideOpen(), paint, SkMatrix::I(), SkRect::MakeIWH(dstW, dstH));
+    dst->drawRect(GrNoClip(), paint, SkMatrix::I(), SkRect::MakeIWH(dstW, dstH));
     return true;
 }
 
 bool GrTextureToYUVPlanes(GrTexture* texture, const SkISize sizes[3], void* const planes[3],
                           const size_t rowBytes[3], SkYUVColorSpace colorSpace) {
     if (GrContext* context = texture->getContext()) {
         // Depending on the relative sizes of the y, u, and v planes we may do 1 to 3 draws/
         // readbacks.
         sk_sp<GrDrawContext> yuvDrawContext;
         sk_sp<GrDrawContext> yDrawContext;
@@ skipping 164 matching lines @@
                 if (!tex->readPixels(0, 0, sizes[2].fWidth, sizes[2].fHeight,
                                      kAlpha_8_GrPixelConfig, planes[2], rowBytes[2])) {
                     return false;
                 }
                 return true;
             }
         }
     }
     return false;
 }