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

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/localized_error.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 error_page::OfflinePageStatus;
 using ui::PageTransition;
 
 DEFINE_WEB_CONTENTS_USER_DATA_KEY(chrome_browser_net::NetErrorTabHelper);
 
 namespace chrome_browser_net {
 
 namespace {
 
 static NetErrorTabHelper::TestingState testing_state_ =
     NetErrorTabHelper::TESTING_DEFAULT;
@@ skipping 72 matching lines @@
     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;
 
 #if defined(OS_ANDROID)
-  SetHasOfflinePages(render_frame_host);
+  SetOfflinePageInfo(render_frame_host);
 #endif
 }
 
 void NetErrorTabHelper::DidCommitProvisionalLoadForFrame(
     content::RenderFrameHost* render_frame_host,
     const GURL& url,
     PageTransition transition_type) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   if (render_frame_host->GetParent())
@@ skipping 32 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)
 #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()
 
   return handled;
 }
 
 NetErrorTabHelper::NetErrorTabHelper(WebContents* contents)
     : WebContentsObserver(contents),
       is_error_page_(false),
@@ skipping 89 matching lines @@
   // 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);
 }
 
 #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_PAGES_COPIES;
+  }
   render_frame_host->Send(
-      new ChromeViewMsg_SetHasOfflinePages(
-          render_frame_host->GetRoutingID(),
-          has_offline_pages));
+      new ChromeViewMsg_SetOfflinePageInfo(
+          render_frame_host->GetRoutingID(), status));
 }
 
 void NetErrorTabHelper::ShowOfflinePages() {
   DCHECK(web_contents());
   TabAndroid* tab = TabAndroid::FromWebContents(web_contents());
   if (tab)
     tab->ShowOfflinePages();
 }
-#endif
+
+void NetErrorTabHelper::LoadOfflineCopy(const GURL& url) {
+  GURL validated_url(url);
+  if (!validated_url.is_valid())
+    return;

[mmenke, 2015/11/17 21:02:15]

Should we also compare the URL with the web_contents URL (Using
GetVisibleURL())?  Not sure how much that really gets us, though.

[jianli, 2015/11/19 02:23:46]

Done.

+
+  DCHECK(web_contents());
+  TabAndroid* tab = TabAndroid::FromWebContents(web_contents());
+  if (tab)
+    tab->LoadOfflineCopy(url);
+}
+#endif  // defined(OS_ANDROID)
 
 }  // namespace chrome_browser_net