Implement upload progress handling in Mojo loading

content/child/url_loader_client_impl.h

Index: content/child/url_loader_client_impl.h
diff --git a/content/child/url_loader_client_impl.h b/content/child/url_loader_client_impl.h
index ada64af8cb5e5928565af62125c49ccc7ecc6295..730636557a6ad6d67a67c23df7d1b2bb77af276f 100644
--- a/content/child/url_loader_client_impl.h
+++ b/content/child/url_loader_client_impl.h
@@ -60,6 +60,9 @@ class CONTENT_EXPORT URLLoaderClientImpl final : public mojom::URLLoaderClient {
   void OnReceiveRedirect(const net::RedirectInfo& redirect_info,
                          const ResourceResponseHead& response_head) override;
   void OnDataDownloaded(int64_t data_len, int64_t encoded_data_len) override;
+  void OnUploadProgress(int64_t current_position,
+                        int64_t total_size,
+                        const base::Closure& ack_callback) override;
   void OnTransferSizeUpdated(int32_t transfer_size_diff) override;
   void OnStartLoadingResponseBody(
       mojo::ScopedDataPipeConsumerHandle body) override;