fix lint error

Author: ColdPaleLight

lib/ui/painting/image_encoding_skia.cc

@@ -17,8 +17,6 @@ void ConvertImageToRasterSkia(
     const fml::WeakPtr<GrDirectContext>& resource_context,
     const fml::TaskRunnerAffineWeakPtr<SnapshotDelegate>& snapshot_delegate,
     const std::shared_ptr<const fml::SyncSwitch>& is_gpu_disabled_sync_switch) {
-  FML_DCHECK(raster_task_runner && io_task_runner);
-
   // If the owning_context is kRaster, we can't access it on this task runner.
   if (dl_image->owning_context() != DlImage::OwningContext::kRaster) {
     auto image = dl_image->skia_image();
@@ -52,6 +50,18 @@ void ConvertImageToRasterSkia(
     }
   }
 
+  if (!raster_task_runner) {
+    FML_LOG(ERROR) << "Raster task runner was null.";
+    encode_task(nullptr);
+    return;
+  }
+
+  if (!io_task_runner) {
+    FML_LOG(ERROR) << "IO task runner was null.";
+    encode_task(nullptr);
+    return;
+  }
+
   // Cross-context images do not support makeRasterImage. Convert these images
   // by drawing them into a surface.  This must be done on the raster thread
   // to prevent concurrent usage of the image on both the IO and raster threads.