Add more data to SnapshotMergeReported.

This adds io_uring, userspace snapshots, and xor compression information
to SnapshotMergeReported.

Bug: 222117189
Test: stats_testdrive after OTA
Change-Id: I94f046cd7bd621a3b166c470f2a1e113363c8e8c
diff --git a/common/dynamic_partition_control_stub.cc b/common/dynamic_partition_control_stub.cc
index 6283b1d..ac11faf 100644
--- a/common/dynamic_partition_control_stub.cc
+++ b/common/dynamic_partition_control_stub.cc
@@ -42,6 +42,11 @@
   return FeatureFlag(FeatureFlag::Value::NONE);
 }
 
+FeatureFlag
+DynamicPartitionControlStub::GetVirtualAbUserspaceSnapshotsFeatureFlag() {
+  return FeatureFlag(FeatureFlag::Value::NONE);
+}
+
 bool DynamicPartitionControlStub::OptimizeOperation(
     const std::string& partition_name,
     const InstallOperation& operation,