Convert GrClip to an abstract base class

src/image/SkImage_Gpu.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 "SkAutoPixmapStorage.h"
 #include "GrCaps.h"
 #include "GrContext.h"
@@ skipping 251 matching lines @@
         return nullptr;
     }
 
     GrPaint paint;
     paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
     paint.addColorFragmentProcessor(GrYUVEffect::CreateYUVToRGB(yTex, uTex, vTex, yuvSizes,
                                                                 colorSpace))->unref();
 
     const SkRect rect = SkRect::MakeWH(SkIntToScalar(width), SkIntToScalar(height));
 
-    drawContext->drawRect(GrClip::WideOpen(), paint, SkMatrix::I(), rect);
+    drawContext->drawRect(GrNoClip(), paint, SkMatrix::I(), rect);
     ctx->flushSurfaceWrites(drawContext->accessRenderTarget());
     return sk_make_sp<SkImage_Gpu>(width, height, kNeedNewImageUniqueID,
                                    kOpaque_SkAlphaType,
                                    drawContext->asTexture().get(), budgeted);
 }
 
 static sk_sp<SkImage> create_image_from_maker(GrTextureMaker* maker, SkAlphaType at, uint32_t id) {
     SkAutoTUnref<GrTexture> texture(maker->refTextureForParams(GrTextureParams::ClampNoFilter()));
     if (!texture) {
         return nullptr;
@@ skipping 166 matching lines @@
         return nullptr;
     }
 
     const SkIRect srcR = SkIRect::MakeWH(desc.fWidth, desc.fHeight);
     const SkIPoint dstP = SkIPoint::Make(0, 0);
     ctx->copySurface(dst, src, srcR, dstP);
     ctx->flushSurfaceWrites(dst);
     return dst;
 }