Add DynamicPartitionControlInterface::UpdateUsesSnapshotCompression

This function returns whether Virtual A/B
compression is enabled for the ongoing update.

Test: TH
Bug: 178732971
Change-Id: I781802443afd1d8deac046a8da198658220f7ba0
diff --git a/aosp/dynamic_partition_control_android.h b/aosp/dynamic_partition_control_android.h
index 9e11279..a0d7f30 100644
--- a/aosp/dynamic_partition_control_android.h
+++ b/aosp/dynamic_partition_control_android.h
@@ -105,6 +105,8 @@
 
   bool IsDynamicPartition(const std::string& part_name) override;
 
+  bool UpdateUsesSnapshotCompression() override;
+
  protected:
   // These functions are exposed for testing.