Reader Mode distillability uses Mojo

components/dom_distiller/content/common/distillability_service.mojom

Index: components/dom_distiller/content/common/distillability_service.mojom
diff --git a/components/dom_distiller/content/common/distillability_service.mojom b/components/dom_distiller/content/common/distillability_service.mojom
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+// Copyright 2016 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.
+
+module dom_distiller;
+
+// This service is implemented in the browser process and is used by the
+// renderer to notify the Reader Mode UI if a page is distillable.
+interface DistillabilityService {
+  NotifyIsDistillable(bool page_is_distillable, bool is_last_update);
+};