Fix possible use of std::moved value in Rasterizer (#22125)

shell/common/rasterizer.cc

@@ -307,7 +307,8 @@ sk_sp<SkImage> Rasterizer::ConvertToRasterImage(sk_sp<SkImage> image) {
     return nullptr;
   }
 
-  return DoMakeRasterSnapshot(image->dimensions(),
+  SkISize image_size = image->dimensions();
+  return DoMakeRasterSnapshot(image_size,
                               [image = std::move(image)](SkCanvas* canvas) {
                                 canvas->drawImage(image, 0, 0);
                               });