Add flags and experiment config for selecting triggering 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
new file mode 100644
index 0000000000000000000000000000000000000000..b84eb1561f4edb147e3dd6efeeb44bd21c79f5df
--- /dev/null
+++ b/components/dom_distiller/core/experiments.cc
@@ -0,0 +1,27 @@
+// 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.
+
+#include "components/dom_distiller/core/experiments.h"
+
+#include "base/command_line.h"
+#include "base/metrics/field_trial.h"
+#include "components/dom_distiller/core/dom_distiller_switches.h"
+
+namespace dom_distiller {
+DistillerHeuristicsType GetDistillerHeuristicsType() {
+  // Get the field trial name first to ensure the experiment is initialized.
+  const std::string group_name =
+      base::FieldTrialList::FindFullName("ReaderModeUI");
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableReaderModeOGArticleHeuristics) ||
+      group_name == "OGArticle" || group_name == "ForcedOGArticle") {
+    return DistillerHeuristicsType::OG_ARTICLE;
+  } else if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+                 switches::kEnableReaderModeAdaBoostHeuristics) ||
+             group_name == "AdaBoost" || group_name == "ForcedAdaBoost") {
+    return DistillerHeuristicsType::ADABOOST_MODEL;
+  }
+  return DistillerHeuristicsType::NONE;
+}
+}