Apply the CTM to the offset in the slow SkOffsetImageFilter path.

src/effects/SkOffsetImageFilter.cpp

Index: src/effects/SkOffsetImageFilter.cpp
diff --git a/src/effects/SkOffsetImageFilter.cpp b/src/effects/SkOffsetImageFilter.cpp
index b36ef8a3ed68b703770be01c7593613824571208..6322a5a9b3c80f8e221f2208ea78a230d1be7e87 100644
--- a/src/effects/SkOffsetImageFilter.cpp
+++ b/src/effects/SkOffsetImageFilter.cpp
@@ -58,7 +58,9 @@ bool SkOffsetImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& source,
         paint.setXfermodeMode(SkXfermode::kSrc_Mode);
         canvas.translate(SkIntToScalar(srcOffset.fX - bounds.fLeft),
                          SkIntToScalar(srcOffset.fY - bounds.fTop));
-        canvas.drawBitmap(src, fOffset.x(), fOffset.y(), &paint);
+        SkVector vec;
+        matrix.mapVectors(&vec, &fOffset, 1);
+        canvas.drawBitmap(src, vec.x(), vec.y(), &paint);
         *result = device->accessBitmap(false);
         offset->fX = bounds.fLeft;
         offset->fY = bounds.fTop;