Enable download page action for error page

chrome/browser/android/offline_pages/offline_page_utils.cc

 // Copyright 2015 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_utils.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/string_util.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "chrome/browser/android/offline_pages/offline_page_mhtml_archiver.h"
 #include "chrome/browser/android/offline_pages/offline_page_model_factory.h"
 #include "chrome/browser/android/offline_pages/offline_page_tab_helper.h"
 #include "chrome/browser/android/offline_pages/request_coordinator_factory.h"
 #include "chrome/browser/android/tab_android.h"
+#include "chrome/browser/net/net_error_tab_helper.h"
 #include "components/offline_pages/core/background/request_coordinator.h"
 #include "components/offline_pages/core/background/save_page_request.h"
 #include "components/offline_pages/core/client_namespace_constants.h"
 #include "components/offline_pages/core/client_policy_controller.h"
 #include "components/offline_pages/core/offline_page_feature.h"
 #include "components/offline_pages/core/offline_page_item.h"
 #include "components/offline_pages/core/offline_page_model.h"
 #include "components/offline_pages/core/request_header/offline_page_header.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/web_contents.h"
@@ skipping 101 matching lines @@
 
 // static
 bool OfflinePageUtils::IsShowingOfflinePreview(
     content::WebContents* web_contents) {
   OfflinePageTabHelper* tab_helper =
       OfflinePageTabHelper::FromWebContents(web_contents);
   return tab_helper && tab_helper->IsShowingOfflinePreview();
 }
 
 // static
+bool OfflinePageUtils::IsShowingDownloadButtonInErrorPage(
+    content::WebContents* web_contents) {
+  chrome_browser_net::NetErrorTabHelper* tab_helper =
+      chrome_browser_net::NetErrorTabHelper::FromWebContents(web_contents);
+  return tab_helper && tab_helper->is_showing_download_button_in_error_page();
+}
+
+// static
 bool OfflinePageUtils::GetTabId(content::WebContents* web_contents,
                                 int* tab_id) {
   TabAndroid* tab_android = TabAndroid::FromWebContents(web_contents);
   if (!tab_android)
     return false;
   *tab_id = tab_android->GetAndroidId();
   return true;
 }
 
 // static
@@ skipping 64 matching lines @@
   GURL::Replacements remove_params;
   remove_params.ClearRef();
 
   GURL lhs_stripped = lhs.ReplaceComponents(remove_params);
   GURL rhs_stripped = rhs.ReplaceComponents(remove_params);
 
   return lhs_stripped == rhs_stripped;
 }
 
 }  // namespace offline_pages