Upgrade SkSpecialImage to have getTextureRef & getROPixels entry points

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 "SkImageFilterCacheKey.h"
 
@@ skipping 583 matching lines @@
                                                  const Context& ctx,
                                                  SkIPoint* offset) const {
     SkImageFilter* input = this->getInput(index);
     if (!input) {
         return sk_sp<SkSpecialImage>(SkRef(src));
     }
 
     sk_sp<SkSpecialImage> result(input->filterImage(src, this->mapContext(ctx), offset));
 
 #if SK_SUPPORT_GPU
-    if (src->peekTexture() && result && !result->peekTexture()) {
+    if (src->isTextureBacked() && result && !result->isTextureBacked()) {
         // Keep the result on the GPU - this is still required for some
         // image filters that don't support GPU in all cases
-        GrContext* context = src->peekTexture()->getContext();
+        GrContext* context = src->getContext();
         return result->makeTextureImage(src->internal_getProxy(), context);
     }
 #endif
 
     return result;
 }
 
 #if SK_SUPPORT_GPU
 
 bool SkImageFilter::filterInputGPUDeprecated(int index, SkImageFilter::Proxy* proxy,
@@ skipping 206 matching lines @@
         dev = SkBitmapDevice::Create(cinfo.fInfo, surfaceProps);
     }
     return dev;
 }
 
 bool SkImageFilter::DeviceProxy::filterImage(const SkImageFilter* filter, const SkBitmap& src,
                                        const SkImageFilter::Context& ctx,
                                        SkBitmap* result, SkIPoint* offset) {
     return fDevice->filterImage(filter, src, ctx, result, offset);
 }