Add incremental updates for multipage distillation.

components/dom_distiller/content/dom_distiller_viewer_source.cc

 // 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.
 
 #include "components/dom_distiller/content/dom_distiller_viewer_source.h"
 
 #include <sstream>
 #include <string>
 #include <vector>
 
@@ skipping 40 matching lines @@
 class RequestViewerHandle : public ViewRequestDelegate {
  public:
   explicit RequestViewerHandle(
       const content::URLDataSource::GotDataCallback& callback);
   virtual ~RequestViewerHandle();
 
   // ViewRequestDelegate implementation.
   virtual void OnArticleReady(const DistilledArticleProto* article_proto)
       OVERRIDE;
 
+  virtual void OnArticleUpdated(ArticleDistillationUpdate article_update)
+      OVERRIDE;
+
   void TakeViewerHandle(scoped_ptr<ViewerHandle> viewer_handle);
 
  private:
   // 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_;
 
   // This holds the callback to where the data retrieved is sent back.
   content::URLDataSource::GotDataCallback callback_;
 };
@@ skipping 23 matching lines @@
     title = l10n_util::GetStringUTF8(IDS_DOM_DISTILLER_VIEWER_NO_DATA_TITLE);
     unsafe_article_html =
         l10n_util::GetStringUTF8(IDS_DOM_DISTILLER_VIEWER_NO_DATA_CONTENT);
   }
   std::string unsafe_page_html =
       ReplaceHtmlTemplateValues(title, unsafe_article_html);
   callback_.Run(base::RefCountedString::TakeString(&unsafe_page_html));
   base::MessageLoop::current()->DeleteSoon(FROM_HERE, this);
 }
 
+void RequestViewerHandle::OnArticleUpdated(
+    ArticleDistillationUpdate article_update) {
+  // TODO(nyquist): Add support for displaying pages incrementally.
+}
+
 void RequestViewerHandle::TakeViewerHandle(
     scoped_ptr<ViewerHandle> viewer_handle) {
   viewer_handle_ = viewer_handle.Pass();
 }
 
 DomDistillerViewerSource::DomDistillerViewerSource(
     DomDistillerService* dom_distiller_service,
     const std::string& scheme)
     : scheme_(scheme), dom_distiller_service_(dom_distiller_service) {}
 
@@ skipping 70 matching lines @@
     *path = request->url().host();
   }
 };
 
 std::string DomDistillerViewerSource::GetContentSecurityPolicyObjectSrc()
     const {
   return "object-src 'none'; style-src 'self'";
 }
 
 }  // namespace dom_distiller