Convert GrClip to an abstract base class

src/gpu/effects/GrConfigConversionEffect.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 "GrConfigConversionEffect.h"
 #include "GrContext.h"
 #include "GrDrawContext.h"
@@ skipping 214 matching lines @@
         paint1.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
 
 
         sk_sp<GrDrawContext> readDrawContext(
                                     context->drawContext(sk_ref_sp(readTex->asRenderTarget())));
         if (!readDrawContext) {
             failed = true;
             break;
         }
 
-        readDrawContext->fillRectToRect(GrClip::WideOpen(),
+        readDrawContext->fillRectToRect(GrNoClip(),
                                         paint1,
                                         SkMatrix::I(),
                                         kDstRect,
                                         kSrcRect);
 
         readTex->readPixels(0, 0, 256, 256, kRGBA_8888_GrPixelConfig, firstRead);
 
         paint2.addColorFragmentProcessor(upmToPM);
         paint2.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
 
         sk_sp<GrDrawContext> tempDrawContext(
                                     context->drawContext(sk_ref_sp(tempTex->asRenderTarget())));
         if (!tempDrawContext) {
             failed = true;
             break;
         }
-        tempDrawContext->fillRectToRect(GrClip::WideOpen(),
+        tempDrawContext->fillRectToRect(GrNoClip(),
                                         paint2,
                                         SkMatrix::I(),
                                         kDstRect,
                                         kSrcRect);
 
         paint3.addColorFragmentProcessor(pmToUPM2);
         paint3.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
 
         readDrawContext = context->drawContext(sk_ref_sp(readTex->asRenderTarget()));
         if (!readDrawContext) {
             failed = true;
             break;
         }
 
-        readDrawContext->fillRectToRect(GrClip::WideOpen(),
+        readDrawContext->fillRectToRect(GrNoClip(),
                                         paint3,
                                         SkMatrix::I(),
                                         kDstRect,
                                         kSrcRect);
 
         readTex->readPixels(0, 0, 256, 256, kRGBA_8888_GrPixelConfig, secondRead);
 
         failed = false;
         for (int y = 0; y < 256 && !failed; ++y) {
             for (int x = 0; x <= y; ++x) {
@@ skipping 23 matching lines @@
     } else {
         if (kRGBA_8888_GrPixelConfig != texture->config() &&
             kBGRA_8888_GrPixelConfig != texture->config() &&
             kNone_PMConversion != pmConversion) {
             // The PM conversions assume colors are 0..255
             return nullptr;
         }
         return new GrConfigConversionEffect(texture, swizzle, pmConversion, matrix);
     }
 }