Add incremental updates for multipage distillation.

components/dom_distiller/core/task_tracker.h

 // Copyright 2013 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_TASK_TRACKER_H_
 #define COMPONENTS_DOM_DISTILLER_CORE_TASK_TRACKER_H_
 
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/memory/weak_ptr.h"
+#include "components/dom_distiller/core/article_distillation_update.h"
 #include "components/dom_distiller/core/article_entry.h"
 #include "components/dom_distiller/core/distiller.h"
 #include "components/dom_distiller/core/proto/distilled_page.pb.h"
 
 class GURL;
 
 namespace dom_distiller {
 
 class DistilledArticleProto;
 
@@ skipping 14 matching lines @@
 // Interface for a DOM distiller entry viewer. Implement this to make a view
 // request and receive the data for an entry when it becomes available.
 class ViewRequestDelegate {
  public:
   virtual ~ViewRequestDelegate() {}
   // Called when the distilled article contents are available. The
   // DistilledArticleProto is owned by a TaskTracker instance and is invalidated
   // when the corresponding ViewerHandle is destroyed (or when the
   // DomDistillerService is destroyed).
   virtual void OnArticleReady(const DistilledArticleProto* article_proto) = 0;
+
+  // Called when an article that is currently under distillation is updated.
+  virtual void OnArticleUpdated(ArticleDistillationUpdate article_update) = 0;
 };
 
 // A TaskTracker manages the various tasks related to viewing, saving,
 // distilling, and fetching an article's distilled content.
 //
 // There are two sources of distilled content, a Distiller and the BlobFetcher.
 // At any time, at most one of each of these will be in-progress (if one
 // finishes, the other will be cancelled).
 //
 // There are also two consumers of that content, a view request and a save
@@ skipping 26 matching lines @@
   void CancelSaveCallbacks();
 
   // The ViewerHandle should be destroyed before the ViewRequestDelegate.
   scoped_ptr<ViewerHandle> AddViewer(ViewRequestDelegate* delegate);
 
   const std::string& GetEntryId() const;
   bool HasEntryId(const std::string& entry_id) const;
   bool HasUrl(const GURL& url) const;
 
  private:
-  void OnDistilledDataReady(
+  void OnDistilledArticleReady(
       scoped_ptr<DistilledArticleProto> distilled_article);
+  void OnArticleDistillationUpdated(
+      const ArticleDistillationUpdate& article_update);
   // Posts a task to run DoSaveCallbacks with |distillation_succeeded|.
   void ScheduleSaveCallbacks(bool distillation_succeeded);
 
   // Runs all callbacks passing |distillation_succeeded| and clears them. Should
   // be called through ScheduleSaveCallbacks.
   void DoSaveCallbacks(bool distillation_succeeded);
 
   void RemoveViewer(ViewRequestDelegate* delegate);
   void NotifyViewer(ViewRequestDelegate* delegate);
 
@@ skipping 15 matching lines @@
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<TaskTracker> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskTracker);
 };
 
 }  // namespace dom_distiller
 
 #endif  // COMPONENTS_DOM_DISTILLER_CORE_TASK_TRACKER_H_