Add FeatureFlag for Virtual AB Compression

Test: treehugger
Bug: 168554689
Change-Id: I732cd1ef55c5c4362ef88a640c2ca228f472af89
diff --git a/dynamic_partition_control_android.h b/dynamic_partition_control_android.h
index 49967f6..f3805f0 100644
--- a/dynamic_partition_control_android.h
+++ b/dynamic_partition_control_android.h
@@ -36,6 +36,7 @@
   ~DynamicPartitionControlAndroid();
   FeatureFlag GetDynamicPartitionsFeatureFlag() override;
   FeatureFlag GetVirtualAbFeatureFlag() override;
+  FeatureFlag GetVirtualAbCompressionFeatureFlag() override;
   bool OptimizeOperation(const std::string& partition_name,
                          const InstallOperation& operation,
                          InstallOperation* optimized) override;
@@ -277,6 +278,7 @@
   std::set<std::string> mapped_devices_;
   const FeatureFlag dynamic_partitions_;
   const FeatureFlag virtual_ab_;
+  const FeatureFlag virtual_ab_compression_;
   std::unique_ptr<android::snapshot::ISnapshotManager> snapshot_;
   std::unique_ptr<android::snapshot::AutoDevice> metadata_device_;
   bool target_supports_snapshot_ = false;