Serve offline page for online URL on disconnected or bad networks

chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.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/renderer_host/chrome_resource_dispatcher_host_delegate.h"
 
 #include <stdint.h>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 87 matching lines @@
 #include <google/protobuf/repeated_field.h>
 #else
 #include "third_party/protobuf/src/google/protobuf/repeated_field.h"
 #endif
 
 #if BUILDFLAG(ANDROID_JAVA_UI)
 #include "chrome/browser/android/intercept_download_resource_throttle.h"
 #endif
 
 #if defined(OS_ANDROID)
-#include "chrome/browser/android/offline_pages/offline_page_request_handler.h"
+#include "chrome/browser/android/offline_pages/offline_page_request_job.h"
 #include "chrome/browser/renderer_host/data_reduction_proxy_resource_throttle_android.h"
 #include "components/navigation_interception/intercept_navigation_delegate.h"
 #endif
 
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/chromeos/login/signin/merge_session_resource_throttle.h"
 #include "chrome/browser/chromeos/login/signin/merge_session_throttling_utils.h"
 #endif
 
 using content::BrowserThread;
@@ skipping 372 matching lines @@
   }
 #endif
 
   if (io_data->resource_prefetch_predictor_observer()) {
     io_data->resource_prefetch_predictor_observer()->OnRequestStarted(
         request, resource_type, info->GetChildID(), info->GetRenderFrameID());
   }
 
 #if defined(OS_ANDROID)
   if (!io_data->IsOffTheRecord()) {
-    offline_pages::OfflinePageRequestHandler::InitializeHandler(
+    offline_pages::OfflinePageRequestJob::SetOfflinePageRequestInfoForRequest(
         request, resource_type);

[mmenke, 2016/08/19 15:04:09]

I don't think any code is needed here at all.  The OfflinePageRequestJob can
grab resource type from ResourceRequestInfo::ForRequest.  That means we just
need one piece of code to hook up the offline stuff to the network stack.

[jianli, 2016/08/19 19:34:56]

Thanks for the tip. Done.

   }
 #endif
 }
 
 void ChromeResourceDispatcherHostDelegate::DownloadStarting(
     net::URLRequest* request,
     content::ResourceContext* resource_context,
     int child_id,
     int route_id,
     bool is_content_initiated,
@@ skipping 377 matching lines @@
           base::Bind(&ChromeResourceDispatcherHostDelegate::OnAbortedFrameLoad,
                     base::Unretained(this), url, request_loading_time));
       return;
   }
 
   std::string metric_name = (request_loading_time.InMilliseconds() < 100 ?
       "Net.ErrAborted.Fast" : "Net.ErrAborted.Slow");
   rappor::SampleDomainAndRegistryFromGURL(
       g_browser_process->rappor_service(), metric_name, url);
 }