Suppress NEW_NAVIGATION_ENTRY prerenderer failures for ORIGIN_OFFLINE

chrome/browser/prerender/prerender_contents.cc

 // Copyright (c) 2012 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 "chrome/browser/prerender/prerender_contents.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <functional>
@@ skipping 559 matching lines @@
 void PrerenderContents::DidFinishLoad(
     content::RenderFrameHost* render_frame_host,
     const GURL& validated_url) {
   if (!render_frame_host->GetParent())
     has_finished_loading_ = true;
 }
 
 void PrerenderContents::DidNavigateMainFrame(
     const content::LoadCommittedDetails& details,
     const content::FrameNavigateParams& params) {
+  // Prevent ORIGIN_OFFLINE prerenders from being destroyed on location.href
+  // change, since the history is never merged for offline prerenders. Also
+  // avoid adding aliases as they may potentially mark other valid requests to
+  // offline as duplicate.
+  if (origin() == ORIGIN_OFFLINE)
+    return;
+
   // If the prerender made a second navigation entry, abort the prerender. This
   // avoids having to correctly implement a complex history merging case (this
   // interacts with location.replace) and correctly synchronize with the
   // renderer. The final status may be monitored to see we need to revisit this
   // decision. This does not affect client redirects as those do not push new
   // history entries. (Calls to location.replace, navigations before onload, and
   // <meta http-equiv=refresh> with timeouts under 1 second do not create
   // entries in Blink.)
   if (prerender_contents_->GetController().GetEntryCount() > 1) {
     Destroy(FINAL_STATUS_NEW_NAVIGATION_ENTRY);
@@ skipping 156 matching lines @@
 void PrerenderContents::AddResourceThrottle(
     const base::WeakPtr<PrerenderResourceThrottle>& throttle) {
   resource_throttles_.push_back(throttle);
 }
 
 void PrerenderContents::AddNetworkBytes(int64_t bytes) {
   network_bytes_ += bytes;
 }
 
 }  // namespace prerender