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_interface.h b/common/dynamic_partition_control_interface.h
index 2c01b1a..3f735bb 100644
--- a/common/dynamic_partition_control_interface.h
+++ b/common/dynamic_partition_control_interface.h
@@ -75,6 +75,9 @@
   virtual FeatureFlag GetVirtualAbCompressionFeatureFlag() = 0;
   // Return the feature flag for Virtual AB Compression XOR
   virtual FeatureFlag GetVirtualAbCompressionXorFeatureFlag() = 0;
+  // Returns whether userspace snapshots are enabled on the device, but not
+  // whether they're enabled for the update.
+  virtual FeatureFlag GetVirtualAbUserspaceSnapshotsFeatureFlag() = 0;
 
   // Attempt to optimize |operation|.
   // If successful, |optimized| contains an operation with extents that