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(
+  content::RenderFrameHost* render_frame_host) {
+#if defined(OS_ANDROID)
+  TabAndroid* tab =
+      web_contents() ? TabAndroid::FromWebContents(web_contents()) : nullptr;

[Lei Zhang, 2015/11/11 00:55:57]

The rest of the files doesn't seem to care if web_contents() returns a nullptr.
Can you check the lifetime of this class and see if web_contents() is always
valid?

[jianli, 2015/11/11 01:16:47]

Done.

+  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