Pass distillability updates from renderer to browser

components/dom_distiller/content/renderer/distillability_agent.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 COMPONENTS_DOM_DISTILLER_CONTENT_RENDERER_DISTILLABILITY_AGENT_H_
+#define COMPONENTS_DOM_DISTILLER_CONTENT_RENDERER_DISTILLABILITY_AGENT_H_
+
+#include "content/public/renderer/render_frame_observer.h"
+
+namespace dom_distiller {
+
+// DistillabilityAgent returns distillability result to DistillabilityDriver.
+class DistillabilityAgent : public content::RenderFrameObserver {
+ public:
+  DistillabilityAgent(content::RenderFrame* render_frame);
+  ~DistillabilityAgent() override;
+
+  // content::RenderFrameObserver:
+  void DidMeaningfulLayout(blink::WebMeaningfulLayout layout_type) override;
+};
+
+}  // namespace dom_distiller
+
+#endif  // COMPONENTS_DOM_DISTILLER_CONTENT_RENDERER_DISTILLABILITY_AGENT_H_