[NTP] Fix article suggestion clicks contributing to Most Visited tiles

components/sync/protocol/session_specifics.proto

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Sync protocol datatype extension for sessions.
 
 // Update proto_value_conversions{.h,.cc,_unittest.cc} if you change
 // any fields in this file.
 
 syntax = "proto2";
@@ skipping 137 matching lines @@
   // third_party/WebKit/public/platform/WebReferrerPolicy.h.
   optional int32 correct_referrer_policy = 25 [default = 1];
 
   enum PasswordState {
     PASSWORD_STATE_UNKNOWN = 0;
     NO_PASSWORD_FIELD = 1;
     HAS_PASSWORD_FIELD = 2;
   }
   // Whether the Password Manager saw a password field on the page.
   optional PasswordState password_state = 26;
+
+  // Whether the navigation should contribute to Most Visited tiles in the NTP.
+  optional bool navigation_ignore_for_ntp_tiles = 27;
 }
 
 // Navigation information for a single redirection within a single navigation.
 message NavigationRedirect {
   // A URL that redirected while navigating to the virtual_url.
   optional string url = 1;
 }