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.cc b/aosp/dynamic_partition_control_android.cc
index ff2d7ee..c4d6935 100644
--- a/aosp/dynamic_partition_control_android.cc
+++ b/aosp/dynamic_partition_control_android.cc
@@ -1339,4 +1339,8 @@
                    partition_name) != dynamic_partition_list_.end();
 }
 
+bool DynamicPartitionControlAndroid::UpdateUsesSnapshotCompression() {
+  return snapshot_->UpdateUsesCompression();
+}
+
 }  // namespace chromeos_update_engine
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.
 
diff --git a/aosp/mock_dynamic_partition_control_android.h b/aosp/mock_dynamic_partition_control_android.h
index 1d4bb14..682ddfd 100644
--- a/aosp/mock_dynamic_partition_control_android.h
+++ b/aosp/mock_dynamic_partition_control_android.h
@@ -101,6 +101,7 @@
   MOCK_METHOD(bool, MapAllPartitions, (), (override));
   MOCK_METHOD(bool, UnmapAllPartitions, (), (override));
   MOCK_METHOD(bool, IsDynamicPartition, (const std::string&), (override));
+  MOCK_METHOD(bool, UpdateUsesSnapshotCompression, (), (override));
 
   void set_fake_mapped_devices(const std::set<std::string>& fake) override {
     DynamicPartitionControlAndroid::set_fake_mapped_devices(fake);