Add support for multipage distillation.

components/dom_distiller/content/distiller_page_web_contents.cc

Index: components/dom_distiller/content/distiller_page_web_contents.cc
diff --git a/components/dom_distiller/content/distiller_page_web_contents.cc b/components/dom_distiller/content/distiller_page_web_contents.cc
index c0c7ff565225cc228a9ec156c87149037986479f..c55f9da3a69be5ba090b5d135c45c25a44f8e665 100644
--- a/components/dom_distiller/content/distiller_page_web_contents.cc
+++ b/components/dom_distiller/content/distiller_page_web_contents.cc
@@ -62,9 +62,13 @@ void DistillerPageWebContents::DidFinishLoad(int64 frame_id,
                                              const GURL& validated_url,
                                              bool is_main_frame,
                                              RenderViewHost* render_view_host) {
+  if (validated_url != web_contents_->GetURL()) {

[Yaron, 2014/01/29 20:03:41]

Why are these necessary? To ensure the page wasn't redirected?

[shashi, 2014/01/29 22:51:37]

Done, I can use is_main_frame.

+    return;
+  }
   content::WebContentsObserver::Observe(NULL);
   OnLoadURLDone();
 }
+
 void DistillerPageWebContents::DidFailLoad(
     int64 frame_id,
     const GURL& validated_url,
@@ -72,6 +76,9 @@ void DistillerPageWebContents::DidFailLoad(
     int error_code,
     const base::string16& error_description,
     RenderViewHost* render_view_host) {
+  if (validated_url != web_contents_->GetURL()) {
+    return;
+  }
   content::WebContentsObserver::Observe(NULL);
   OnLoadURLFailed();
 }