Add stubs for new API triggerPostinstall

Test: th
Bug: 377557752
Change-Id: I73beaae7feebb12d944d59496db2cf8c89115e93
diff --git a/aosp/binder_service_stable_android.cc b/aosp/binder_service_stable_android.cc
index 3bc7f6c..069f3ba 100644
--- a/aosp/binder_service_stable_android.cc
+++ b/aosp/binder_service_stable_android.cc
@@ -16,8 +16,6 @@
 
 #include "update_engine/aosp/binder_service_stable_android.h"
 
-#include <memory>
-
 #include <base/bind.h>
 #include <base/logging.h>
 #include <binderwrapper/binder_wrapper.h>
@@ -125,4 +123,15 @@
   return true;
 }
 
+android::binder::Status
+BinderUpdateEngineAndroidStableService::triggerPostinstall(
+    const ::android::String16& partition) {
+  Error error;
+  if (!service_delegate_->TriggerPostinstall(
+          android::String8{partition}.c_str(), &error)) {
+    return ErrorPtrToStatus(error);
+  }
+  return Status::ok();
+}
+
 }  // namespace chromeos_update_engine