Enable update_engine to access OTA package via file descriptor

Due to the restriction of Treble, update_engine cannot access to OTA
packages located on non-core domain area.
(e.g. /data/vendor/upgrade/xxx.zip)
To solve such problem, update_engine needs to have a new interface
which accepts a file descriptor (FD) of OTA package file instead of
its URI and to read package file while updating via FD.

Test: Manual update
Bug: 130209137
Change-Id: Ieb7173dc958ba3eb21af708e616ef7078cd17b3e
diff --git a/service_delegate_android_interface.h b/service_delegate_android_interface.h
index 5267bb0..6bd75b6 100644
--- a/service_delegate_android_interface.h
+++ b/service_delegate_android_interface.h
@@ -47,6 +47,13 @@
       const std::vector<std::string>& key_value_pair_headers,
       brillo::ErrorPtr* error) = 0;
 
+  virtual bool ApplyPayload(
+      int fd,
+      int64_t payload_offset,
+      int64_t payload_size,
+      const std::vector<std::string>& key_value_pair_headers,
+      brillo::ErrorPtr* error) = 0;
+
   // Suspend an ongoing update. Returns true if there was an update ongoing and
   // it was suspended. In case of failure, it returns false and sets |error|
   // accordingly.