Add the java proto options in metrics set proto.

Bug: b/279024829
Change-Id: Ib1604465dad1cd8b2b1198d53aa5d75191e56e2d
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/329220
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Manashi Sarkar <manashi@google.com>
Cr-Commit-Position: refs/heads/main@{#41288}
diff --git a/api/test/metrics/proto/metric.proto b/api/test/metrics/proto/metric.proto
index 94921a5..d23b745 100644
--- a/api/test/metrics/proto/metric.proto
+++ b/api/test/metrics/proto/metric.proto
@@ -12,6 +12,9 @@
 
 package webrtc.test_metrics;
 
+option java_multiple_files = true;
+option java_package = "org.webrtc.api.test.metrics.proto";
+
 // Root message of the proto file. Contains collection of all the metrics.
 message MetricsSet {
   repeated Metric metrics = 1;