Refactor the offline page storage to include client namespace and id.

components/offline_pages/offline_page_metadata_store_impl.cc

Index: components/offline_pages/offline_page_metadata_store_impl.cc
diff --git a/components/offline_pages/offline_page_metadata_store_impl.cc b/components/offline_pages/offline_page_metadata_store_impl.cc
index 52620639a023ea8e0b9a0370e1d79ec91727804f..f4212a7a0e5b7c8b40ed1f5ee64b31d62f940243 100644
--- a/components/offline_pages/offline_page_metadata_store_impl.cc
+++ b/components/offline_pages/offline_page_metadata_store_impl.cc
@@ -41,7 +41,7 @@ void OfflinePageItemToEntry(const OfflinePageItem& item,
                             offline_pages::OfflinePageEntry* item_proto) {
   DCHECK(item_proto);
   item_proto->set_url(item.url.spec());
-  item_proto->set_bookmark_id(item.bookmark_id);
+  item_proto->set_offline_id(item.offline_id);
   item_proto->set_version(item.version);
   std::string path_string;
 #if defined(OS_POSIX)
@@ -56,17 +56,19 @@ void OfflinePageItemToEntry(const OfflinePageItem& item,
   item_proto->set_access_count(item.access_count);
   item_proto->set_flags(
       static_cast<::offline_pages::OfflinePageEntry_Flags>(item.flags));
+  item_proto->set_client_id_namespace(item.client_id_namespace);
+  item_proto->set_client_id(item.client_id);
 }
 
 bool OfflinePageItemFromEntry(const offline_pages::OfflinePageEntry& item_proto,
                               OfflinePageItem* item) {
   DCHECK(item);
-  if (!item_proto.has_url() || !item_proto.has_bookmark_id() ||
+  if (!item_proto.has_url() || !item_proto.has_offline_id() ||
       !item_proto.has_version() || !item_proto.has_file_path()) {
     return false;
   }
   item->url = GURL(item_proto.url());
-  item->bookmark_id = item_proto.bookmark_id();
+  item->offline_id = item_proto.offline_id();
   item->version = item_proto.version();
 #if defined(OS_POSIX)
   item->file_path = base::FilePath(item_proto.file_path());
@@ -90,6 +92,18 @@ bool OfflinePageItemFromEntry(const offline_pages::OfflinePageEntry& item_proto,
   if (item_proto.has_flags()) {
     item->flags = static_cast<OfflinePageItem::Flags>(item_proto.flags());
   }
+  item->client_id_namespace = item_proto.client_id_namespace();
+  item->client_id = item_proto.client_id();
+
+  // Legacy storage.
+  if (item->client_id_namespace == ""
+      && item_proto.deprecated_bookmark_id() != 0) {
+    item->client_id_namespace = "bookmark";
+    item->client_id = base::Int64ToString(item_proto.deprecated_bookmark_id());
+    if (item->offline_id == 0) {
+      item->offline_id = item_proto.deprecated_bookmark_id();
+    }
+  }
   return true;
 }
 
@@ -187,7 +201,7 @@ void OfflinePageMetadataStoreImpl::AddOrUpdateOfflinePage(
   OfflinePageEntry offline_page_proto;
   OfflinePageItemToEntry(offline_page_item, &offline_page_proto);
   entries_to_save->push_back(
-      std::make_pair(base::Int64ToString(offline_page_item.bookmark_id),
+      std::make_pair(base::Int64ToString(offline_page_item.offline_id),
                      offline_page_proto));
 
   UpdateEntries(std::move(entries_to_save), std::move(keys_to_remove),
@@ -195,14 +209,14 @@ void OfflinePageMetadataStoreImpl::AddOrUpdateOfflinePage(
 }
 
 void OfflinePageMetadataStoreImpl::RemoveOfflinePages(
-    const std::vector<int64_t>& bookmark_ids,
+    const std::vector<int64_t>& offline_ids,
     const UpdateCallback& callback) {
   scoped_ptr<ProtoDatabase<OfflinePageEntry>::KeyEntryVector> entries_to_save(
       new ProtoDatabase<OfflinePageEntry>::KeyEntryVector());
   scoped_ptr<std::vector<std::string>> keys_to_remove(
       new std::vector<std::string>());
 
-  for (int64_t id : bookmark_ids)
+  for (int64_t id : offline_ids)
     keys_to_remove->push_back(base::Int64ToString(id));
 
   UpdateEntries(std::move(entries_to_save), std::move(keys_to_remove),