Verify that all slice are downloaded when a stream complete

content/browser/download/download_file_impl.h

Index: content/browser/download/download_file_impl.h
diff --git a/content/browser/download/download_file_impl.h b/content/browser/download/download_file_impl.h
index 61f1f4d90bb054a524b32e402f78111c7d1de5a0..e3f6d4dc6aa2873e7dd2da4242354a0c88e63ce9 100644
--- a/content/browser/download/download_file_impl.h
+++ b/content/browser/download/download_file_impl.h
@@ -183,6 +183,9 @@ class CONTENT_EXPORT DownloadFileImpl : public DownloadFile {
   // Register callback and start to read data from the stream.
   void RegisterAndActivateStream(SourceStream* source_stream);
 
+  // Check if download is completed.
+  bool IsDownloadCompleted();
+
   // Return the total valid bytes received in the target file.
   // If the file is a sparse file, return the total number of valid bytes.
   // Otherwise, return the current file size.