[SessionStorage] Metadata parsing and writing for mojo version.

Bug: 716490
Change-Id: If2b0672af149abf44dd475a2196e7b727cb450a7
Reviewed-on: https://chromium-review.googlesource.com/986880
Reviewed-by: John Abd-El-Malek <[email protected]>
Reviewed-by: Marijn Kruisselbrink <[email protected]>
Commit-Queue: Daniel Murphy <[email protected]>
Cr-Commit-Position: refs/heads/master@{#550454}
diff --git a/content/browser/BUILD.gn b/content/browser/BUILD.gn
index a967e1b..e267363 100644
--- a/content/browser/BUILD.gn
+++ b/content/browser/BUILD.gn
@@ -688,6 +688,8 @@
     "dom_storage/session_storage_database.h",
     "dom_storage/session_storage_database_adapter.cc",
     "dom_storage/session_storage_database_adapter.h",
+    "dom_storage/session_storage_metadata.cc",
+    "dom_storage/session_storage_metadata.h",
     "dom_storage/session_storage_namespace_impl.cc",
     "dom_storage/session_storage_namespace_impl.h",
     "download/blob_download_url_loader_factory_getter.cc",