Implement first version of OfflinePageSuggestionsProvider

components/ntp_snippets/ntp_snippets_service.cc

Index: components/ntp_snippets/ntp_snippets_service.cc
diff --git a/components/ntp_snippets/ntp_snippets_service.cc b/components/ntp_snippets/ntp_snippets_service.cc
index e13b8c32d3307316fb25ed6e6e163650915f3d1b..fc3ff800a0df056db1dfd871d2462c917971c4a1 100644
--- a/components/ntp_snippets/ntp_snippets_service.cc
+++ b/components/ntp_snippets/ntp_snippets_service.cc
@@ -222,6 +222,8 @@ NTPSnippetsService::NTPSnippetsService(
   database_->SetErrorCallback(base::Bind(&NTPSnippetsService::OnDatabaseError,
                                          base::Unretained(this)));
 
+  // TODO(pke): Move this to SetObserver as soon as the UI reads from the
+  // ContentSuggestionsService directly.
   // We transition to other states while finalizing the initialization, when the
   // database is done loading.
   database_->LoadSnippets(base::Bind(&NTPSnippetsService::OnDatabaseLoaded,