Add feature extraction for distillability to Blink

third_party/WebKit/Source/web/WebDocument.cpp

Index: third_party/WebKit/Source/web/WebDocument.cpp
diff --git a/third_party/WebKit/Source/web/WebDocument.cpp b/third_party/WebKit/Source/web/WebDocument.cpp
index e10b756e4cdbd1c624d7b2d4aa3bbeab185553f1..8931b88119c87fcc0724bb90697e608ac04d596a 100644
--- a/third_party/WebKit/Source/web/WebDocument.cpp
+++ b/third_party/WebKit/Source/web/WebDocument.cpp
@@ -38,6 +38,7 @@
 #include "core/css/StyleSheetContents.h"
 #include "core/dom/CSSSelectorWatch.h"
 #include "core/dom/Document.h"
+#include "core/dom/DocumentStatisticsCollector.h"
 #include "core/dom/DocumentType.h"
 #include "core/dom/Element.h"
 #include "core/dom/Fullscreen.h"
@@ -56,6 +57,7 @@
 #include "modules/accessibility/AXObject.h"
 #include "modules/accessibility/AXObjectCacheImpl.h"
 #include "platform/weborigin/SecurityOrigin.h"
+#include "public/platform/WebDistillability.h"
 #include "public/platform/WebURL.h"
 #include "public/web/WebAXObject.h"
 #include "public/web/WebDOMEvent.h"
@@ -322,6 +324,11 @@ bool WebDocument::manifestUseCredentials() const
     return equalIgnoringCase(linkElement->fastGetAttribute(HTMLNames::crossoriginAttr), "use-credentials");
 }
 
+WebDistillabilityFeatures WebDocument::distillabilityFeatures()
+{
+    return DocumentStatisticsCollector::collectStatistics(*unwrap<Document>());
+}
+
 WebDocument::WebDocument(const PassRefPtrWillBeRawPtr<Document>& elem)
     : WebNode(elem)
 {