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 "SkCanvas.h"
 #include "SkImage_Base.h"
 #include "SkSpecialImage.h"
 #include "SkSpecialSurface.h"
 
+#include "GrContext.h"
+
 ///////////////////////////////////////////////////////////////////////////////
 class SkSpecialImage_Base : public SkSpecialImage {
 public:
     SkSpecialImage_Base(SkImageFilter::Proxy* proxy, const SkIRect& subset, uint32_t uniqueID)
         : INHERITED(proxy, subset, uniqueID) {
     }
     virtual ~SkSpecialImage_Base() { }
 
     virtual void onDraw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*) const = 0;
 
@@ skipping 136 matching lines @@
     }
 
     bool testingOnlyOnGetROPixels(SkBitmap* result) const override {
         return fImage->asLegacyBitmap(result, SkImage::kRO_LegacyBitmapMode);
     }
 
     SkSpecialSurface* onNewSurface(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::NewRenderTarget(this->proxy(), texture->getContext(), desc);
         }
 #endif
         return SkSpecialSurface::NewRaster(this->proxy(), info, nullptr);
     }
 
     SkSpecialImage* onExtractSubset(const SkIRect& subset) const override {
         SkAutoTUnref<SkImage> subsetImg(fImage->newSubset(subset));
@@ skipping 197 matching lines @@
         if (!fTexture->readPixels(0, 0, result->width(), result->height(), kSkia8888_GrPixelConfig,
                                   result->getPixels(), result->rowBytes())) {
             return false;
         }
 
         result->pixelRef()->setImmutable();
         return true;
     }
 
     SkSpecialSurface* onNewSurface(const SkImageInfo& info) const override {
-        GrSurfaceDesc desc = GrImageInfoToSurfaceDesc(info);
+        GrSurfaceDesc desc = GrImageInfoToSurfaceDesc(info, *fTexture->getContext()->caps());
         desc.fFlags = kRenderTarget_GrSurfaceFlag;
 
         return SkSpecialSurface::NewRenderTarget(this->proxy(), fTexture->getContext(), desc);
     }
 
     SkSpecialImage* onExtractSubset(const SkIRect& subset) const override {
         return SkSpecialImage::NewFromGpu(this->internal_getProxy(),
                                           subset,
                                           this->uniqueID(),
                                           fTexture, 
@@ skipping 20 matching lines @@
 
 SkSpecialImage* SkSpecialImage::NewFromGpu(SkImageFilter::Proxy* proxy,
                                            const SkIRect& subset,
                                            uint32_t uniqueID,
                                            GrTexture* tex,
                                            SkAlphaType at) {
     return nullptr;
 }
 
 #endif