Add "AllArticles" mode to Reader Mode heuristics

components/dom_distiller/core/dom_distiller_switches.h

 // Copyright 2015 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 COMPONENTS_DOM_DISTILLER_CORE_DOM_DISTILLER_SWITCHES_H_
 #define COMPONENTS_DOM_DISTILLER_CORE_DOM_DISTILLER_SWITCHES_H_
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 
@@ skipping 10 matching lines @@
 
 // Switch to enable specific heuristics for detecting if a page is distillable
 // or not.
 extern const char kReaderModeHeuristics[];
 
 // Switch to control the display of the distiller feedback form.
 extern const char kReaderModeFeedback[];
 
 namespace reader_mode_heuristics {
 extern const char kAdaBoost[];
+extern const char kAllArticles[];
 extern const char kOGArticle[];
 extern const char kAlwaysTrue[];
 extern const char kNone[];
 };
 
 namespace reader_mode_feedback {
 extern const char kOn[];
 extern const char kOff[];
 };
 
 }  // namespace switches
 
 #endif  // COMPONENTS_DOM_DISTILLER_CORE_DOM_DISTILLER_SWITCHES_H_