Make bookmark suggestions dismissable

components/ntp_snippets/bookmarks/bookmark_suggestions_provider.cc

Index: components/ntp_snippets/bookmarks/bookmark_suggestions_provider.cc
diff --git a/components/ntp_snippets/bookmarks/bookmark_suggestions_provider.cc b/components/ntp_snippets/bookmarks/bookmark_suggestions_provider.cc
index 85457d2d8d568928e35f897e412e3415de495180..7453fd55878d0e5a0e2058455566592abd555911 100644
--- a/components/ntp_snippets/bookmarks/bookmark_suggestions_provider.cc
+++ b/components/ntp_snippets/bookmarks/bookmark_suggestions_provider.cc
@@ -66,8 +66,9 @@ CategoryStatus BookmarkSuggestionsProvider::GetCategoryStatus(
 
 void BookmarkSuggestionsProvider::DismissSuggestion(
     const std::string& suggestion_id) {
-  // TODO(jkrcal): Implement blacklisting bookmarks until they are next visited.
-  // Then also implement ClearDismissedSuggestionsForDebugging.
+  DCHECK(bookmark_model_->loaded());
+  GURL url(GetWithinCategoryIDFromUniqueID(suggestion_id));
+  MarkBookmarksDismissed(bookmark_model_, url);
 }
 
 void BookmarkSuggestionsProvider::FetchSuggestionImage(
@@ -82,7 +83,9 @@ void BookmarkSuggestionsProvider::ClearCachedSuggestionsForDebugging() {
 }
 
 void BookmarkSuggestionsProvider::ClearDismissedSuggestionsForDebugging() {
-  // TODO(jkrcal): Implement when discarded suggestions are supported.
+  if (!bookmark_model_->loaded())
+    return;
+  MarkAllBookmarksUndismissed(bookmark_model_);
 }
 
 void BookmarkSuggestionsProvider::BookmarkModelLoaded(