Enable download page action for error page

chrome/browser/net/net_error_tab_helper.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/net/net_error_tab_helper.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/io_thread.h"
@@ skipping 124 matching lines @@
 }
 
 bool NetErrorTabHelper::OnMessageReceived(
     const IPC::Message& message,
     content::RenderFrameHost* render_frame_host) {
   if (render_frame_host != web_contents()->GetMainFrame())
     return false;
 #if BUILDFLAG(ANDROID_JAVA_UI)
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(NetErrorTabHelper, message)
-    IPC_MESSAGE_HANDLER(ChromeViewHostMsg_DownloadPageLater, DownloadPageLater)
+    IPC_MESSAGE_HANDLER(ChromeViewHostMsg_DownloadPageLater,
+                        OnDownloadPageLater)
+    IPC_MESSAGE_HANDLER(ChromeViewHostMsg_SetIsShowingDownloadButtonInErrorPage,
+                        OnSetIsShowingDownloadButtonInErrorPage)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
   return handled;
 #else
   return false;
 #endif  // BUILDFLAG(ANDROID_JAVA_UI)
 }
 
 NetErrorTabHelper::NetErrorTabHelper(WebContents* contents)
     : WebContentsObserver(contents),
       network_diagnostics_bindings_(contents, this),
       is_error_page_(false),
       dns_error_active_(false),
       dns_error_page_committed_(false),
+#if BUILDFLAG(ANDROID_JAVA_UI)
+      is_showing_download_button_in_error_page_(false),
+#endif  // BUILDFLAG(ANDROID_JAVA_UI)
       dns_probe_status_(error_page::DNS_PROBE_POSSIBLE),
       weak_factory_(this) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   // If this helper is under test, it won't have a WebContents.
   if (contents)
     InitializePref(contents);
 }
 
 void NetErrorTabHelper::OnMainFrameDnsError() {
@@ skipping 32 matching lines @@
   DVLOG(1) << "Finished DNS probe with result "
            << DnsProbeStatusToString(result) << ".";
 
   dns_probe_status_ = result;
 
   if (dns_error_page_committed_)
     SendInfo();
 }
 
 #if BUILDFLAG(ANDROID_JAVA_UI)
-void NetErrorTabHelper::DownloadPageLater() {
+void NetErrorTabHelper::OnDownloadPageLater() {
   // Makes sure that this is coming from an error page.
   content::NavigationEntry* entry =
       web_contents()->GetController().GetLastCommittedEntry();
   if (!entry || entry->GetPageType() != content::PAGE_TYPE_ERROR)
     return;
 
   // Only download the page for HTTP/HTTPS URLs.
   GURL url(entry->GetVirtualURL());
   if (!url.SchemeIsHTTPOrHTTPS())
     return;
 
   DownloadPageLaterHelper(url);
 }
+
+void NetErrorTabHelper::OnSetIsShowingDownloadButtonInErrorPage(bool show) {

[mmenke, 2017/01/09 20:35:39]

"show" seems a bit short.  Maybe just showing_button or
is_showing_download_button.

[jianli, 2017/01/09 23:35:07]

Done.

+  is_showing_download_button_in_error_page_ = show;
+}
 #endif  // BUILDFLAG(ANDROID_JAVA_UI)
 
 void NetErrorTabHelper::InitializePref(WebContents* contents) {
   DCHECK(contents);
 
   BrowserContext* browser_context = contents->GetBrowserContext();
   Profile* profile = Profile::FromBrowserContext(browser_context);
   resolve_errors_with_web_service_.Init(
       prefs::kAlternateErrorPagesEnabled,
       profile->GetPrefs());
@@ skipping 49 matching lines @@
   offline_pages::ClientId client_id(
       offline_pages::kAsyncNamespace, base::GenerateGUID());
   request_coordinator->SavePageLater(
       page_url, client_id, true /*user_requested*/,
       offline_pages::RequestCoordinator::RequestAvailability::
           ENABLED_FOR_OFFLINER);
 }
 #endif  // BUILDFLAG(ANDROID_JAVA_UI)
 
 }  // namespace chrome_browser_net