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/mock_dynamic_partition_control.h b/common/mock_dynamic_partition_control.h
index fd0a5a9..8cff28f 100644
--- a/common/mock_dynamic_partition_control.h
+++ b/common/mock_dynamic_partition_control.h
@@ -38,6 +38,10 @@
               GetVirtualAbCompressionXorFeatureFlag,
               (),
               (override));
+  MOCK_METHOD(FeatureFlag,
+              GetVirtualAbUserspaceSnapshotsFeatureFlag,
+              (),
+              (override));
   MOCK_METHOD(FeatureFlag, GetVirtualAbFeatureFlag, (), (override));
   MOCK_METHOD(bool, FinishUpdate, (bool), (override));
   MOCK_METHOD(std::unique_ptr<FileDescriptor>,