Upstream dom_distiller iOS factories

ios/chrome/browser/dom_distiller/distiller_viewer.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 IOS_CHROME_BROWSER_DOM_DISTILLER_DISTILLER_VIEWER_H_
+#define IOS_CHROME_BROWSER_DOM_DISTILLER_DISTILLER_VIEWER_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "components/dom_distiller/core/task_tracker.h"
+
+class GURL;
+
+namespace ios {
+class ChromeBrowserState;
+}
+
+namespace dom_distiller {
+
+class DistilledPagePrefs;
+
+// A very simple and naive implementation of the dom_distiller
+// ViewRequestDelegate: From an URL it builds an HTML string and notifies when
+// finished.
+class DistillerViewer : public dom_distiller::ViewRequestDelegate {
+ public:
+  typedef base::Callback<void(const GURL&, const std::string&)>
+      DistillationFinishedCallback;
+
+  DistillerViewer(ios::ChromeBrowserState* browser_state,
+                  const GURL& url,
+                  const DistillationFinishedCallback& callback);
+  ~DistillerViewer() override;
+
+  // ViewRequestDelegate.
+  void OnArticleUpdated(
+      dom_distiller::ArticleDistillationUpdate article_update) override {}
+  void OnArticleReady(const DistilledArticleProto* article_proto) override;
+
+ private:
+  // The url of the distilled page.
+  const GURL url_;
+  // Callback to invoke when the page is finished.
+  DistillationFinishedCallback callback_;
+  // Interface for accessing preferences for distilled pages.
+  scoped_ptr<DistilledPagePrefs> distilled_page_prefs_;
+  // Keeps the distiller going until the view is released.
+  scoped_ptr<dom_distiller::ViewerHandle> viewer_handle_;
+
+  DISALLOW_COPY_AND_ASSIGN(DistillerViewer);
+};
+
+}  // namespace dom_distiller
+
+#endif  // IOS_CHROME_BROWSER_DOM_DISTILLER_DISTILLER_VIEWER_H_