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

ui/base/page_transition_types.h

 // 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.
 
 #ifndef UI_BASE_PAGE_TRANSITION_TYPES_H_
 #define UI_BASE_PAGE_TRANSITION_TYPES_H_
 
 #include <stdint.h>
 
 #include "ui/base/ui_base_export.h"
@@ skipping 91 matching lines @@
 
   // ADDING NEW CORE VALUE? Be sure to update the LAST_CORE and CORE_MASK
   // values below.  Also update CoreTransitionString().
   PAGE_TRANSITION_LAST_CORE = PAGE_TRANSITION_KEYWORD_GENERATED,
   PAGE_TRANSITION_CORE_MASK = 0xFF,
 
   // Qualifiers
   // Any of the core values above can be augmented by one or more qualifiers.
   // These qualifiers further define the transition.
 
+  // The visited URL won't contribute to Most Visited tiles in the NTP.
+  PAGE_TRANSITION_IGNORE_FOR_NTP_TILES = 0x00400000,
+
   // A managed user attempted to visit a URL but was blocked.
   PAGE_TRANSITION_BLOCKED = 0x00800000,
 
   // User used the Forward or Back button to navigate among browsing history.
   PAGE_TRANSITION_FORWARD_BACK = 0x01000000,
 
   // User used the address bar to trigger this navigation.
   PAGE_TRANSITION_FROM_ADDRESS_BAR = 0x02000000,
 
   // User is navigating to the home page.
@@ skipping 74 matching lines @@
 // PageTransitionCoreTypeIs() instead or, in rare cases,
 // PageTransitionTypeIncludingQualifiersIs().
 DontUseOperatorEquals operator==(PageTransition, PageTransition);
 DontUseOperatorEquals operator==(PageTransition, int);
 DontUseOperatorEquals operator==(int, PageTransition);
 #endif  // defined(CONTENT_IMPLEMENTATION)
 
 }  // namespace ui
 
 #endif  // UI_BASE_PAGE_TRANSITION_TYPES_H_