Move common distiller code to superclass

components/dom_distiller/core/dom_distiller_request_view_base.h

Index: components/dom_distiller/core/dom_distiller_request_view_base.h
diff --git a/components/dom_distiller/core/dom_distiller_request_view_base.h b/components/dom_distiller/core/dom_distiller_request_view_base.h
new file mode 100644
index 0000000000000000000000000000000000000000..16b8ca7d93debd0eb6d6a741cea6943cc253495c
--- /dev/null
+++ b/components/dom_distiller/core/dom_distiller_request_view_base.h
@@ -0,0 +1,87 @@
+// 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_CORE_DOM_DISTILLER_REQUEST_VIEW_BASE_H_
+#define COMPONENTS_DOM_DISTILLER_CORE_DOM_DISTILLER_REQUEST_VIEW_BASE_H_
+
+#include <sstream>
+#include <string>
+#include <vector>
+
+#include "base/memory/ref_counted_memory.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/strings/utf_string_conversions.h"
+#include "components/dom_distiller/core/distilled_page_prefs.h"
+#include "components/dom_distiller/core/dom_distiller_service.h"
+#include "components/dom_distiller/core/task_tracker.h"
+#include "components/dom_distiller/core/viewer.h"
+#include "content/public/browser/url_data_source.h"
+#include "net/base/url_util.h"
+
+namespace dom_distiller {
+
+// This interface is used to abstract the data callback from the distiller. The
+// callbacks for different platforms have different numbers of parameters
+// (namely iOS and Android) which makes this necessary.
+class DistillerDataCallback {
+ public:
+  virtual ~DistillerDataCallback(){};
+  virtual void RunCallback(std::string& data) = 0;
+};
+
+// Handles receiving data asynchronously for a specific entry, and passing
+// it along to the data callback for the data source. Lifetime matches that of
+// the current main frame's page in the Viewer instance.
+class DomDistillerRequestViewBase
+    : public ViewRequestDelegate,
+      public DistilledPagePrefs::Observer {
+ public:
+  explicit DomDistillerRequestViewBase(
+      scoped_ptr<DistillerDataCallback> callback,
+      DistilledPagePrefs* distilled_page_prefs);
+  ~DomDistillerRequestViewBase() override;
+
+  // Flag this request as an error and send the error page template.
+  void FlagAsErrorPage();
+  // Get if this viewer is in an error state.
+  bool IsErrorPage();
+
+  // ViewRequestDelegate implementation:
+  void OnArticleReady(const DistilledArticleProto* article_proto) override;
+
+  void OnArticleUpdated(ArticleDistillationUpdate article_update) override;
+
+  void TakeViewerHandle(scoped_ptr<ViewerHandle> viewer_handle);
+
+ protected:
+  // DistilledPagePrefs::Observer implementation:
+  void OnChangeFontFamily(
+      DistilledPagePrefs::FontFamily new_font_family) override;
+  void OnChangeTheme(DistilledPagePrefs::Theme new_theme) override;
+
+  // Sends JavaScript to the attached Viewer, buffering data if the viewer isn't
+  // ready.
+  virtual void SendJavaScript(const std::string& buffer) = 0;
+
+  // The handle to the view request towards the DomDistillerService. It
+  // needs to be kept around to ensure the distillation request finishes.
+  scoped_ptr<ViewerHandle> viewer_handle_;
+
+  // Holds the callback to where the data retrieved is sent back.
+  scoped_ptr<DistillerDataCallback> callback_;
+
+  // Number of pages of the distilled article content that have been rendered by
+  // the viewer.
+  int page_count_;
+
+  // Interface for accessing preferences for distilled pages.
+  DistilledPagePrefs* distilled_page_prefs_;
+
+  // Flag to tell this observer that the web contents are in an error state.
+  bool is_error_page_;
+};
+
+}  // namespace dom_distiller
+
+#endif  // COMPONENTS_DOM_DISTILLER_CORE_DOM_DISTILLER_REQUEST_VIEW_BASE_H_