Include target CS in SkColorSpaceXformCanvas' image info

Bug: skia:
Change-Id: Idcf9c933e1a236772e0b5edd3ba8437d1a6ae293
Reviewed-on: https://skia-review.googlesource.com/69502
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Brian Osman <brianosman@google.com>

src/core/SkColorSpaceXformCanvas.cpp

@@ -46,7 +46,7 @@ public:
     }
 
     SkImageInfo onImageInfo() const override {
-        return fTarget->imageInfo();
+        return fTarget->imageInfo().makeColorSpace(fTargetCS);
     }
 
     void onDrawPaint(const SkPaint& paint) override {