Add "Show saved copy" button in dino page when there's offline copy

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 a0e73cf6cb1e2c50084dc6ce1a1817860884b2fe..0b45fd1b3e0a8774b4c13ea500fbc5ac18a82d0f 100644
--- a/chrome/browser/net/net_error_tab_helper.cc
+++ b/chrome/browser/net/net_error_tab_helper.cc
@@ -13,6 +13,7 @@
 #include "chrome/browser/net/net_error_diagnostics_dialog.h"
 #include "chrome/browser/platform_util.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/common/localized_error.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/render_messages.h"
 #include "components/error_page/common/net_error_info.h"
@@ -124,7 +125,7 @@ void NetErrorTabHelper::DidStartProvisionalLoadForFrame(
   is_error_page_ = is_error_page;
 
 #if defined(OS_ANDROID)
-  SetHasOfflinePages(render_frame_host);
+  SetOfflinePageInfo(render_frame_host);
 #endif
 }
 
@@ -177,6 +178,7 @@ bool NetErrorTabHelper::OnMessageReceived(
                         RunNetworkDiagnostics)
 #if defined(OS_ANDROID)
     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_ShowOfflinePages, ShowOfflinePages)
+    IPC_MESSAGE_HANDLER(ChromeViewHostMsg_LoadOfflineCopy, LoadOfflineCopy)
 #endif
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
@@ -286,15 +288,19 @@ void NetErrorTabHelper::RunNetworkDiagnosticsHelper(
 }
 
 #if defined(OS_ANDROID)
-void NetErrorTabHelper::SetHasOfflinePages(
+void NetErrorTabHelper::SetOfflinePageInfo(
   content::RenderFrameHost* render_frame_host) {
   DCHECK(web_contents());
+  OfflinePageStatus status = OfflinePageStatus::NONE;
   TabAndroid* tab = TabAndroid::FromWebContents(web_contents());
-  bool has_offline_pages = tab && tab->HasOfflinePages();
+  if (tab && tab->HasOfflinePages()) {
+    status = tab->HasOfflineCopyForCurrentPage() ?
+        OfflinePageStatus::HAS_PAGE_COPY : OfflinePageStatus::HAS_OTHER_COPIES;
+  }
   render_frame_host->Send(
-      new ChromeViewMsg_SetHasOfflinePages(
+      new ChromeViewMsg_SetOfflinePageInfo(
           render_frame_host->GetRoutingID(),
-          has_offline_pages));
+          static_cast<int>(status)));
 }
 
 void NetErrorTabHelper::ShowOfflinePages() {
@@ -303,6 +309,13 @@ void NetErrorTabHelper::ShowOfflinePages() {
   if (tab)
     tab->ShowOfflinePages();
 }
+
+void NetErrorTabHelper::LoadOfflineCopy(const GURL& url) {
+  DCHECK(web_contents());
+  TabAndroid* tab = TabAndroid::FromWebContents(web_contents());
+  if (tab)
+    tab->LoadOfflineCopy(url);
+}
 #endif
 
 }  // namespace chrome_browser_net