Add feature extraction for distillability to Blink

third_party/WebKit/public/platform/WebDistillability.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 WebDistillability_h
+#define WebDistillability_h
+
+namespace blink {
+
+struct WebDistillabilityFeatures {
+    bool isMobileFriendly;
+    // The rest of the fields are only valid when isMobileFriendly==false.
+    bool openGraph;
+    unsigned elementCount;
+    unsigned anchorCount;
+    unsigned formCount;
+    unsigned textInputCount;
+    unsigned passwordInputCount;
+    unsigned pCount;
+    unsigned preCount;
+    // The following scores are derived from the triggering logic in Readability from Mozilla.
+    // https://github.com/mozilla/readability/blob/85101066386a0872526a6c4ae164c18fcd6cc1db/Readability.js#L1704
+    double mozScore;
+    double mozScoreAllSqrt;
+    double mozScoreAllLinear;
+};
+
+} // namespace blink
+
+#endif // WebDistillability_h