sRGB support in Ganesh. Several pieces:

src/core/SkSpecialImage.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 "SkSpecialImage.h"
 
 #if SK_SUPPORT_GPU
 #include "GrTexture.h"
@@ skipping 118 matching lines @@
     return ib->getBitmapDeprecated(result);
 }
 
 SkImageFilter::Proxy* SkSpecialImage::internal_getProxy() const {
     return fProxy;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 #include "SkImage.h"
 #if SK_SUPPORT_GPU
+#include "GrContext.h"
 #include "SkGrPriv.h"
 #endif
 
 class SkSpecialImage_Image : public SkSpecialImage_Base {
 public:
     SkSpecialImage_Image(SkImageFilter::Proxy* proxy,
                          const SkIRect& subset,
                          sk_sp<SkImage> image)
         : INHERITED(proxy, subset, image->uniqueID())
         , fImage(image) {
@@ skipping 50 matching lines @@
     }
 
     bool testingOnlyOnGetROPixels(SkBitmap* result) const override {
         return fImage->asLegacyBitmap(result, SkImage::kRO_LegacyBitmapMode);
     }
 
     sk_sp<SkSpecialSurface> onMakeSurface(const SkImageInfo& info) const override {
 #if SK_SUPPORT_GPU
         GrTexture* texture = as_IB(fImage.get())->peekTexture();
         if (texture) {
-            GrSurfaceDesc desc = GrImageInfoToSurfaceDesc(info);
+            GrSurfaceDesc desc = GrImageInfoToSurfaceDesc(info, *texture->getContext()->caps());
             desc.fFlags = kRenderTarget_GrSurfaceFlag;
 
             return SkSpecialSurface::MakeRenderTarget(this->proxy(), texture->getContext(), desc);
         }
 #endif
         return SkSpecialSurface::MakeRaster(this->proxy(), info, nullptr);
     }
 
     sk_sp<SkSpecialImage> onMakeSubset(const SkIRect& subset) const override {
         sk_sp<SkImage> subsetImg(fImage->makeSubset(subset));
@@ skipping 203 matching lines @@
         if (!fTexture->readPixels(0, 0, result->width(), result->height(), kSkia8888_GrPixelConfig,
                                   result->getPixels(), result->rowBytes())) {
             return false;
         }
 
         result->pixelRef()->setImmutable();
         return true;
     }
 
     sk_sp<SkSpecialSurface> onMakeSurface(const SkImageInfo& info) const override {
-        GrSurfaceDesc desc = GrImageInfoToSurfaceDesc(info);
+        GrSurfaceDesc desc = GrImageInfoToSurfaceDesc(info, *fTexture->getContext()->caps());
         desc.fFlags = kRenderTarget_GrSurfaceFlag;
 
         return SkSpecialSurface::MakeRenderTarget(this->proxy(), fTexture->getContext(), desc);
     }
 
     sk_sp<SkSpecialImage> onMakeSubset(const SkIRect& subset) const override {
         return SkSpecialImage::MakeFromGpu(this->internal_getProxy(),
                                            subset,
                                            this->uniqueID(),
                                            fTexture, 
@@ skipping 20 matching lines @@
 
 sk_sp<SkSpecialImage> SkSpecialImage::MakeFromGpu(SkImageFilter::Proxy* proxy,
                                                   const SkIRect& subset,
                                                   uint32_t uniqueID,
                                                   GrTexture* tex,
                                                   SkAlphaType at) {
     return nullptr;
 }
 
 #endif