Support for distilling prior pages in an article.

components/dom_distiller/core/distiller.cc

Index: components/dom_distiller/core/distiller.cc
diff --git a/components/dom_distiller/core/distiller.cc b/components/dom_distiller/core/distiller.cc
index 18d8693ea9569411890abe394647691312df7556..fb52ddeeb3491bf51585e7e60a8d06df481d5b7c 100644
--- a/components/dom_distiller/core/distiller.cc
+++ b/components/dom_distiller/core/distiller.cc
@@ -149,6 +149,10 @@ void DistillerImpl::OnPageDistillationFinished(
       // The pages should be in same origin.
       DCHECK_EQ(next_page_url.GetOrigin(), page_url.GetOrigin());
     }
+    GURL prev_page_url(distilled_page->prev_page_url);
+    if (prev_page_url.is_valid()) {
+      DCHECK_EQ(prev_page_url.GetOrigin(), page_url.GetOrigin());
+    }
 
     for (size_t img_num = 0; img_num < distilled_page->image_urls.size();
          ++img_num) {
@@ -157,6 +161,7 @@ void DistillerImpl::OnPageDistillationFinished(
       FetchImage(page_num, image_id, distilled_page->image_urls[img_num]);
     }
 
+    AddToDistillationQueue(page_num - 1, prev_page_url);

[cjhopman, 2014/02/15 02:45:53]

nit: this could be done in the prev_page_url.is_valid() block above

[shashi, 2014/02/17 03:43:20]

Done.

     AddToDistillationQueue(page_num + 1, next_page_url);
     AddPageIfDone(page_num);
     DistillNextPage();