Add "AllArticles" mode to Reader Mode heuristics

components/dom_distiller/core/experiments.cc

Index: components/dom_distiller/core/experiments.cc
diff --git a/components/dom_distiller/core/experiments.cc b/components/dom_distiller/core/experiments.cc
index 900daecd4b50191ebee2d68ceba68582b543f0e0..ba011f508f9afc573d132a6db9dc4c7050b927ab 100644
--- a/components/dom_distiller/core/experiments.cc
+++ b/components/dom_distiller/core/experiments.cc
@@ -21,6 +21,9 @@ DistillerHeuristicsType GetDistillerHeuristicsType() {
     if (switch_value == switches::reader_mode_heuristics::kAdaBoost) {
       return DistillerHeuristicsType::ADABOOST_MODEL;
     }
+    if (switch_value == switches::reader_mode_heuristics::kAllArticles) {
+      return DistillerHeuristicsType::ALL_ARTICLES;
+    }
     if (switch_value == switches::reader_mode_heuristics::kOGArticle) {
       return DistillerHeuristicsType::OG_ARTICLE;
     }
@@ -36,6 +39,10 @@ DistillerHeuristicsType GetDistillerHeuristicsType() {
                          base::CompareCase::INSENSITIVE_ASCII)) {
       return DistillerHeuristicsType::ADABOOST_MODEL;
     }
+    if (base::StartsWith(group_name, "AllArticles",
+                         base::CompareCase::INSENSITIVE_ASCII)) {
+      return DistillerHeuristicsType::ALL_ARTICLES;
+    }
     if (base::StartsWith(group_name, "OGArticle",
                          base::CompareCase::INSENSITIVE_ASCII)) {
       return DistillerHeuristicsType::OG_ARTICLE;