Cleanup some sRGB TODOs, mostly around setting GrPaint flags correctly

src/core/SkSpecialSurface.cpp

Index: src/core/SkSpecialSurface.cpp
diff --git a/src/core/SkSpecialSurface.cpp b/src/core/SkSpecialSurface.cpp
index 4c482dfffb72ff72cdae014ed516265a9a336650..85bb61a3e3fe02f897cd18b7b7072b4a0f2950b0 100644
--- a/src/core/SkSpecialSurface.cpp
+++ b/src/core/SkSpecialSurface.cpp
@@ -137,12 +137,12 @@ public:
     ~SkSpecialSurface_Gpu() override { }
 
     sk_sp<SkSpecialImage> onMakeImageSnapshot() override {
-        // TODO: Supply color space from fDrawContext, once it's present
-        sk_sp<SkSpecialImage> tmp(SkSpecialImage::MakeFromGpu(this->subset(),
-                                                              kNeedNewImageUniqueID_SpecialImage,
-                                                              fDrawContext->asTexture(),
-                                                              nullptr,
-                                                              &this->props()));
+        sk_sp<SkSpecialImage> tmp(SkSpecialImage::MakeFromGpu(
+                                                           this->subset(),
+                                                           kNeedNewImageUniqueID_SpecialImage,
+                                                           fDrawContext->asTexture(),
+                                                           sk_ref_sp(fDrawContext->getColorSpace()),
+                                                           &this->props()));
         fDrawContext = nullptr;
         return tmp;
     }