Serve offline page for online URL on disconnected or bad networks

chrome/browser/android/offline_pages/offline_page_request_interceptor.cc

+// Copyright 2016 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/android/offline_pages/offline_page_request_interceptor.h"
+
+#include "base/supports_user_data.h"
+#include "chrome/browser/android/offline_pages/offline_page_request_job.h"
+
+namespace offline_pages {
+
+OfflinePageRequestInterceptor::OfflinePageRequestInterceptor(void* profile_id)
+    : profile_id_(profile_id) {
+  DCHECK(profile_id);
+}
+
+OfflinePageRequestInterceptor::~OfflinePageRequestInterceptor() {}
+
+net::URLRequestJob* OfflinePageRequestInterceptor::MaybeInterceptRequest(
+    net::URLRequest* request,
+    net::NetworkDelegate* network_delegate) const {
+  // OfflinePageRequestJob::Create may return a nullptr if the interception
+  // is not needed for some sort of requests, like non-main resource request,
+  // non-http request and more.
+  return OfflinePageRequestJob::Create(profile_id_, request, network_delegate);
+}
+
+}  // namespace offline_pages