Wait for APK to be fully downloaded for full APK digests.

Bug: 160605420
Test: atest ChecksumsTest
Change-Id: Ib9fd591c67290786268b6dcdc57c7db153612e01
diff --git a/services/incremental/BinderIncrementalService.h b/services/incremental/BinderIncrementalService.h
index 8b40350..8478142 100644
--- a/services/incremental/BinderIncrementalService.h
+++ b/services/incremental/BinderIncrementalService.h
@@ -66,6 +66,8 @@
                             int32_t destStorageId, const std::string& destPath,
                             int32_t* _aidl_return) final;
     binder::Status unlink(int32_t storageId, const std::string& path, int32_t* _aidl_return) final;
+    binder::Status isFileFullyLoaded(int32_t storageId, const std::string& path,
+                                     int32_t* _aidl_return) final;
     binder::Status getLoadingProgress(int32_t storageId, float* _aidl_return) final;
     binder::Status getMetadataByPath(int32_t storageId, const std::string& path,
                                      std::vector<uint8_t>* _aidl_return) final;