Add incremental updates for multipage distillation.

components/dom_distiller/core/article_distillation_update.h

+// Copyright 2014 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_CORE_ARTICLE_DISTILLATION_UPDATE_H_
+#define COMPONENTS_DOM_DISTILLER_CORE_ARTICLE_DISTILLATION_UPDATE_H_
+
+#include <vector>
+
+#include "base/memory/ref_counted.h"
+#include "components/dom_distiller/core/proto/distilled_page.pb.h"
+
+namespace dom_distiller {
+
+// Update about an article that is currently under distillation.
+class ArticleDistillationUpdate {
+ public:
+  typedef scoped_refptr<base::RefCountedData<DistilledPageProto> >
+      RefCountedDistilledPageProto;
+
+  ArticleDistillationUpdate(
+      const std::vector<RefCountedDistilledPageProto>& pages,
+      bool has_next_page,
+      bool has_prev_page);
+  ~ArticleDistillationUpdate();
+
+  const RefCountedDistilledPageProto getDistilledPage(size_t index) const;

[cjhopman, 2014/02/28 02:38:14]

this should return a const& (not const value).

[cjhopman, 2014/02/28 02:38:14]

s/get/Get

[shashi, 2014/03/02 02:53:40]

This is a scoped_refptr<>, maybe I should rename it to 
RefPtrToDistilledPageProto ?

[shashi, 2014/03/02 02:53:40]

Done.

+
+  size_t getPagesSize() const;

[cjhopman, 2014/02/28 02:38:14]

capitalize first letters of function names

[shashi, 2014/03/02 02:53:40]

Done.

+
+  bool hasNextPage() const;
+
+  bool hasPrevPage() const;
+
+ private:
+  // True, if article has a next page.
+  bool has_next_page_;
+  // True, if article has a previous page.
+  bool has_prev_page_;
+  // Currently available pages.
+  std::vector<RefCountedDistilledPageProto> pages_;
+};
+
+}  // namespace dom_distiller
+
+#endif  // COMPONENTS_DOM_DISTILLER_CORE_ARTICLE_DISTILLATION_UPDATE_H_