Add "SHOW ALL SAVED PAGES" button to offline error page

chrome/browser/net/net_error_tab_helper.cc

Index: chrome/browser/net/net_error_tab_helper.cc
diff --git a/chrome/browser/net/net_error_tab_helper.cc b/chrome/browser/net/net_error_tab_helper.cc
index 8e325f9be01b1103ffc5f6c8a10b0606006b6049..8e422ddfdecb7affeecbd7d843498ab8b6297613 100644
--- a/chrome/browser/net/net_error_tab_helper.cc
+++ b/chrome/browser/net/net_error_tab_helper.cc
@@ -22,6 +22,10 @@
 #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;
@@ -118,6 +122,8 @@ void NetErrorTabHelper::DidStartProvisionalLoadForFrame(
     return;
 
   is_error_page_ = is_error_page;
+
+  SetHasOfflinePages(render_frame_host);
 }
 
 void NetErrorTabHelper::DidCommitProvisionalLoadForFrame(
@@ -167,6 +173,7 @@ bool NetErrorTabHelper::OnMessageReceived(
   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()
 
@@ -274,4 +281,26 @@ void NetErrorTabHelper::RunNetworkDiagnosticsHelper(
   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