[Net] Propagate priority changes from HttpNetworkTransaction to its request

net/http/http_stream_factory.h

Index: net/http/http_stream_factory.h
diff --git a/net/http/http_stream_factory.h b/net/http/http_stream_factory.h
index bebfb8cbb1f832feea9ad9b52f26566be1a9a574..135aef9bd6b050d55e8cd033e3e2bb8602c88ac6 100644
--- a/net/http/http_stream_factory.h
+++ b/net/http/http_stream_factory.h
@@ -157,6 +157,9 @@ class NET_EXPORT_PRIVATE HttpStreamRequest {
   virtual int RestartTunnelWithProxyAuth(
       const AuthCredentials& credentials) = 0;
 
+  // Called when the priority of the parent transaction changes.
+  virtual void SetPriority(RequestPriority priority) = 0;
+
   // Returns the LoadState for the request.
   virtual LoadState GetLoadState() const = 0;