Add a skeleton class for VABCPartitionWriter

Bug: 168554689
Test: treehugger
Change-Id: Ib73084b779620db47d2ff4fbb6d87f38047e9211
diff --git a/Android.bp b/Android.bp
index 9187e67..27ba172 100644
--- a/Android.bp
+++ b/Android.bp
@@ -124,6 +124,7 @@
         "libfec_rs",
         "libpuffpatch",
         "libverity_tree",
+        "libsnapshot_cow",
     ],
     shared_libs: [
         "libbase",
@@ -179,6 +180,8 @@
         "payload_consumer/payload_metadata.cc",
         "payload_consumer/payload_verifier.cc",
         "payload_consumer/partition_writer.cc",
+        "payload_consumer/partition_writer_factory_android.cc",
+        "payload_consumer/vabc_partition_writer.cc",
         "payload_consumer/postinstall_runner_action.cc",
         "payload_consumer/verity_writer_android.cc",
         "payload_consumer/xz_extent_writer.cc",