Add "SHOW ALL SAVED PAGES" button to offline 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 "base/prefs/pref_service.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/io_thread.h"
 #include "chrome/browser/net/dns_probe_service.h"
 #include "chrome/browser/net/net_error_diagnostics_dialog.h"
 #include "chrome/browser/platform_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/render_messages.h"
 #include "components/error_page/common/net_error_info.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_frame_host.h"
 #include "ipc/ipc_message_macros.h"
 #include "net/base/net_errors.h"
 #include "url/gurl.h"
 
+#if defined(OS_ANDROID)
+#include "chrome/browser/android/tab_android.h"
+#endif
+
 using content::BrowserContext;
 using content::BrowserThread;
 using content::WebContents;
 using content::WebContentsObserver;
 using error_page::DnsProbeStatus;
 using error_page::DnsProbeStatusToString;
 using ui::PageTransition;
 
 DEFINE_WEB_CONTENTS_USER_DATA_KEY(chrome_browser_net::NetErrorTabHelper);
 
@@ skipping 76 matching lines @@
     content::RenderFrameHost* render_frame_host,
     const GURL& validated_url,
     bool is_error_page,
     bool is_iframe_srcdoc) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   if (render_frame_host->GetParent())
     return;
 
   is_error_page_ = is_error_page;
+
+  SetHasOfflinePages(render_frame_host);
 }
 
 void NetErrorTabHelper::DidCommitProvisionalLoadForFrame(
     content::RenderFrameHost* render_frame_host,
     const GURL& url,
     PageTransition transition_type) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   if (render_frame_host->GetParent())
     return;
@@ skipping 29 matching lines @@
   }
 }
 
 bool NetErrorTabHelper::OnMessageReceived(
     const IPC::Message& message,
     content::RenderFrameHost* render_frame_host) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(NetErrorTabHelper, message)
     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_RunNetworkDiagnostics,
                         RunNetworkDiagnostics)
+    IPC_MESSAGE_HANDLER(ChromeViewHostMsg_ShowOfflinePages, ShowOfflinePages)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
   return handled;
 }
 
 NetErrorTabHelper::NetErrorTabHelper(WebContents* contents)
     : WebContentsObserver(contents),
       is_error_page_(false),
       dns_error_active_(false),
@@ skipping 87 matching lines @@
     return;
   // Sanitize URL prior to running diagnostics on it.
   RunNetworkDiagnosticsHelper(url.GetOrigin().spec());
 }
 
 void NetErrorTabHelper::RunNetworkDiagnosticsHelper(
     const std::string& sanitized_url) {
   ShowNetworkDiagnosticsDialog(web_contents(), sanitized_url);
 }
 
+void NetErrorTabHelper::SetHasOfflinePages(

[newt (away), 2015/11/09 22:15:13]

Does this get called on every page load, or only when an error page is showing?
If it's the former, it seems rather wasteful; seems like we could just query
this state once when we're showing the error page.

[jianli, 2015/11/09 23:08:56]

Good catch. Added is_error_page_ check to bail out if not an error page.

[mmenke, 2015/11/09 23:11:47]

Hrm...Does that actually work?  Won't the message reach the renderer too late?

[jianli, 2015/11/10 00:14:26]

You're right. |is_error_page_| is only set when the error page is being
reloaded. I also tried to set it in DidFailProvisionalLoad, but it was too late.
The error page setup is only done at DidStartProvisionalLoadForFrame stage. So
we will live with calling this on every page load based on existing
infrastructure.

+  content::RenderFrameHost* render_frame_host) {
+#if defined(OS_ANDROID)
+  TabAndroid* tab =
+      web_contents() ? TabAndroid::FromWebContents(web_contents()) : nullptr;
+  bool has_offline_pages = (tab && tab->HasOfflinePages());
+  render_frame_host->Send(
+      new ChromeViewMsg_SetHasOfflinePages(
+          render_frame_host->GetRoutingID(),
+          has_offline_pages));
+#endif
+}
+
+void NetErrorTabHelper::ShowOfflinePages() {
+#if defined(OS_ANDROID)
+  TabAndroid* tab =
+      web_contents() ? TabAndroid::FromWebContents(web_contents()) : nullptr;
+  if (tab)
+    tab->ShowOfflinePages();
+#endif
+}
+
 }  // namespace chrome_browser_net