[Offline Pages] Make prerenderer notify us of network progress.

chrome/browser/prerender/prerender_handle.cc

Index: chrome/browser/prerender/prerender_handle.cc
diff --git a/chrome/browser/prerender/prerender_handle.cc b/chrome/browser/prerender/prerender_handle.cc
index 8c51ff7465ccf23a514dd6388adbf6dde0f44db2..7abdcedac7faf6a55d541ee4a048b8fe679a46f1 100644
--- a/chrome/browser/prerender/prerender_handle.cc
+++ b/chrome/browser/prerender/prerender_handle.cc
@@ -109,6 +109,13 @@ void PrerenderHandle::OnPrerenderStop(PrerenderContents* prerender_contents) {
     observer_->OnPrerenderStop(this);
 }
 
+void PrerenderHandle::OnNetworkBytesChanged(
+    PrerenderContents* prerender_contents) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  if (observer_)
+    observer_->OnNetworkBytesChanged(this);
+}
+
 bool PrerenderHandle::RepresentingSamePrerenderAs(
     PrerenderHandle* other) const {
   return other && other->prerender_data_ && prerender_data_ &&