Route live save snapshots through PPI policy

src/legacy_document_session_services.cpp

@@ -40,6 +40,32 @@ pp::foundation::Status prepare_legacy_document_save_snapshot(App& app, const cha
 
     const auto report = pp::app::make_document_canvas_save_snapshot_report(snapshot.value());
     log_legacy_document_save_snapshot(context, report);
+    const auto route = pp::app::plan_document_canvas_save_writer_route(report);
+    if (!route.uses_document_ppi_writer) {
+        LOG(
+            "%s document save writer retained legacy save: %.*s",
+            context,
+            static_cast<int>(route.fallback_reason.size()),
+            route.fallback_reason.data());
+        return pp::foundation::Status::success();
+    }
+
+    const auto exported = pp::app::export_document_canvas_save_snapshot_to_ppi(snapshot.value());
+    if (!exported) {
+        LOG(
+            "%s document save writer retained legacy save after PPI export failure: %s",
+            context,
+            exported.status().message);
+        return exported.status();
+    }
+
+    LOG(
+        "%s document save writer route: document-ppi payloadComplete=%s bytes=%llu capturedFaces=%zu pendingFaces=%zu",
+        context,
+        exported.value().report.payload_complete ? "true" : "false",
+        static_cast<unsigned long long>(exported.value().bytes.size()),
+        exported.value().report.captured_face_payloads,
+        exported.value().report.pending_face_payloads);
     return pp::foundation::Status::success();
 }