sRGB support in Ganesh. Several pieces:

src/core/SkSpecialImage.cpp

Index: src/core/SkSpecialImage.cpp
diff --git a/src/core/SkSpecialImage.cpp b/src/core/SkSpecialImage.cpp
index b17d5d4147d998d85016a1f2d50c6bbb63ac91e7..b59bb414056867fa833c985b3fc279e36afa6ab0 100644
--- a/src/core/SkSpecialImage.cpp
+++ b/src/core/SkSpecialImage.cpp
@@ -10,6 +10,8 @@
 #include "SkSpecialImage.h"
 #include "SkSpecialSurface.h"
 
+#include "GrContext.h"
+
 ///////////////////////////////////////////////////////////////////////////////
 class SkSpecialImage_Base : public SkSpecialImage {
 public:
@@ -166,7 +168,7 @@ public:
 #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);
@@ -384,7 +386,7 @@ public:
     }
 
     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);