Stop showing notifications if they're ignored

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 9d5e9a293285c0dc9d27bd400863ca012ce1b2a9..e31a4adfff8a2126d9b797f446501a8cb0d769ea 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1543,6 +1543,11 @@ const char kNtpCollapsedSnapshotDocument[] = "ntp.collapsed_snapshot_document";
 
 // Keeps track of sync promo collapsed state in the Other Devices menu.
 const char kNtpCollapsedSyncPromo[] = "ntp.collapsed_sync_promo";
+
+// Tracks how many notifications the user has ignored, so we can tell when we
+// should stop showing them.
+const char kContentSuggestionsConsecutiveIgnoredPrefName[] =
+    "ntp.content_suggestions.notifications.consecutive_ignored";
 #endif  // defined(OS_ANDROID)
 
 // Which page should be visible on the new tab page v4