Add unittest for lz4diff postfix feature

Test: th
Bug: 206729162

Change-Id: If2e9446fbb04e9bb264ed8101fb761a6c591d23a
diff --git a/lz4diff/lz4patch.cc b/lz4diff/lz4patch.cc
index 1dcf933..7766e24 100644
--- a/lz4diff/lz4patch.cc
+++ b/lz4diff/lz4patch.cc
@@ -297,6 +297,10 @@
   return true;
 }
 
+bool Lz4Patch(const Blob& src_data, const Blob& patch_data, Blob* output) {
+  return Lz4Patch(ToStringView(src_data), ToStringView(patch_data), output);
+}
+
 std::ostream& operator<<(std::ostream& out, const CompressionAlgorithm& info) {
   out << "Algo {type: " << info.Type_Name(info.type());
   if (info.level() != 0) {