Revert of Add Gr*Proxy classes

src/core/SkImageFilter.cpp

 /*
  * Copyright 2012 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkImageFilter.h"
 
 #include "SkCanvas.h"
@@ skipping 262 matching lines @@
 }
 
 #if SK_SUPPORT_GPU
 sk_sp<SkSpecialImage> SkImageFilter::DrawWithFP(GrContext* context,
                                                 sk_sp<GrFragmentProcessor> fp,
                                                 const SkIRect& bounds) {
     GrPaint paint;
     paint.addColorFragmentProcessor(fp.get());
     paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
 
-    sk_sp<GrDrawContext> drawContext(context->newDrawContext(SkBackingFit::kApprox,
+    sk_sp<GrDrawContext> drawContext(context->newDrawContext(GrContext::kLoose_BackingFit,
                                                              bounds.width(), bounds.height(),
                                                              kRGBA_8888_GrPixelConfig));
     if (!drawContext) {
         return nullptr;
     }
 
     SkRect srcRect = SkRect::Make(bounds);
     SkRect dstRect = SkRect::MakeWH(srcRect.width(), srcRect.height());
     GrClip clip(dstRect);
     drawContext->fillRectToRect(clip, paint, SkMatrix::I(), dstRect, srcRect);
@@ skipping 145 matching lines @@
     sk_sp<SkSpecialImage> result(input->filterImage(src, this->mapContext(ctx), offset));
 
     SkASSERT(!result || src->isTextureBacked() == result->isTextureBacked());
 
     return result;
 }
 
 void SkImageFilter::PurgeCache() {
     SkImageFilterCache::Get()->purge();
 }