Add a new set of page features for distillability testing

components/dom_distiller/core/page_features.h

Index: components/dom_distiller/core/page_features.h
diff --git a/components/dom_distiller/core/page_features.h b/components/dom_distiller/core/page_features.h
index 236796b542aecb860e3cb03311872183e50aec4f..3f7d208bc124e0f95e1d7f5cdc2ff682c4b07dc5 100644
--- a/components/dom_distiller/core/page_features.h
+++ b/components/dom_distiller/core/page_features.h
@@ -10,19 +10,24 @@
 #include "base/values.h"
 #include "url/gurl.h"
 
+class GURL;
+
+namespace blink {
+  struct WebDistillabilityFeatures;
+}
+
 namespace dom_distiller {
 
 // The length of the derived features vector.
 extern int kDerivedFeaturesCount;
 
 // The distillable page detector is a model trained on a list of numeric
-// features derived from core more complex features of a webpage (like the
-// body's .textContent). This derives the numeric features for a set of core
-// features.
+// features derived from features of a webpage (like body's number of elements
+// ). This derives the numeric features form a set of core features.
 //
 // Note: It is crucial that these features are derived in the same way and are
 // in the same order as in the training pipeline. See //heuristics/distillable
-// in the external DomDistillerJs repo.
+// in the external DomDistiller repo.
 std::vector<double> CalculateDerivedFeatures(bool isOGArticle,
                                              const GURL& url,
                                              double numElements,
@@ -37,6 +42,10 @@ std::vector<double> CalculateDerivedFeatures(bool isOGArticle,
 std::vector<double> CalculateDerivedFeaturesFromJSON(
     const base::Value* stringified_json);
 
+std::vector<double> CalculateDerivedFeatures(
+    const blink::WebDistillabilityFeatures& f,
+    const GURL& url);
+
 }  // namespace dom_distiller
 
 #endif  // COMPONENTS_DOM_DISTILLER_CORE_PAGE_FEATURES_H_