[API] Add vm_payload API to get APK contents path

Bug: 243515282
Test: atest MicrodroidTests
Change-Id: Ic78d0744ef6ae5cd39a86a9cfcc08a3c85519621
diff --git a/tests/testapk/src/native/testbinary.cpp b/tests/testapk/src/native/testbinary.cpp
index d57d224..1a3e940 100644
--- a/tests/testapk/src/native/testbinary.cpp
+++ b/tests/testapk/src/native/testbinary.cpp
@@ -112,6 +112,17 @@
             }
             return ndk::ScopedAStatus::ok();
         }
+
+        ndk::ScopedAStatus getApkContentsPath(std::string* out) override {
+            const char* path_c = AVmPayload_getApkContentsPath();
+            if (path_c == nullptr) {
+                return ndk::ScopedAStatus::
+                        fromServiceSpecificErrorWithMessage(0, "Failed to get APK contents path");
+            }
+            std::string path(path_c);
+            *out = path;
+            return ndk::ScopedAStatus::ok();
+        }
     };
     auto testService = ndk::SharedRefBase::make<TestService>();