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

chrome/common/localized_error.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/common/localized_error.h"
 
 #include "base/command_line.h"
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
 #include "base/metrics/field_trial.h"
@@ skipping 536 matching lines @@
 }  // namespace
 
 const char LocalizedError::kHttpErrorDomain[] = "http";
 
 void LocalizedError::GetStrings(int error_code,
                                 const std::string& error_domain,
                                 const GURL& failed_url,
                                 bool is_post,
                                 bool stale_copy_in_cache,
                                 bool can_show_network_diagnostics_dialog,
-                                bool has_offline_pages,
+                                OfflinePageStatus offline_page_status,
                                 const std::string& locale,
                                 const std::string& accept_languages,
                                 scoped_ptr<error_page::ErrorPageParams> params,
                                 base::DictionaryValue* error_strings) {
   webui::SetLoadTimeDataDefaults(locale, error_strings);
 
   // Grab the strings and settings that depend on the error type.  Init
   // options with default values.
   LocalizedErrorMap options = {
     0,
@@ skipping 193 matching lines @@
             IDS_ERRORPAGES_BUTTON_SHOW_SAVED_COPY));
     show_saved_copy_button->SetString(
         "title",
         l10n_util::GetStringUTF16(IDS_ERRORPAGES_BUTTON_SHOW_SAVED_COPY_HELP));
     if (show_saved_copy_primary)
       show_saved_copy_button->SetString("primary", "true");
     error_strings->Set("showSavedCopyButton", show_saved_copy_button);
   }
 
 #if defined(OS_ANDROID)
-  if (has_offline_pages) {
-    base::DictionaryValue* show_saved_pages_button = new base::DictionaryValue;
-    show_saved_pages_button->SetString(
-        "msg",
-        l10n_util::GetStringUTF16(IDS_ERRORPAGES_BUTTON_SHOW_SAVED_PAGES));
-    show_saved_pages_button->SetString(
-        "title",
-        l10n_util::GetStringUTF16(IDS_ERRORPAGES_BUTTON_SHOW_SAVED_PAGES));
-    error_strings->Set("showSavedPagesButton", show_saved_pages_button);
+  // Offline button will not be provided when we want to show something in the
+  // cache.
+  if (!show_saved_copy_visible) {
+    if (offline_page_status == OfflinePageStatus::HAS_PAGE_COPY) {
+      base::DictionaryValue* show_offline_copy_button =
+          new base::DictionaryValue;
+      base::string16 button_text =
+          l10n_util::GetStringUTF16(IDS_ERRORPAGES_BUTTON_SHOW_OFFLINE_COPY);
+      show_offline_copy_button->SetString("msg", button_text);
+      show_offline_copy_button->SetString("title", button_text);
+      error_strings->Set("showOfflineCopyButton", show_offline_copy_button);
+    } else if (offline_page_status == OfflinePageStatus::HAS_OTHER_COPIES) {
+      base::DictionaryValue* show_offline_pages_button =
+          new base::DictionaryValue;
+      base::string16 button_text =
+          l10n_util::GetStringUTF16(IDS_ERRORPAGES_BUTTON_SHOW_OFFLINE_PAGES);
+      show_offline_pages_button->SetString("msg", button_text);
+      show_offline_pages_button->SetString("title", button_text);
+      error_strings->Set("showOfflinePagesButton", show_offline_pages_button);
+    }
   }
 #endif
 
 #if defined(OS_CHROMEOS)
   // ChromeOS has its own diagnostics extension, which doesn't rely on a
   // browser-initiated dialog.
   can_show_network_diagnostics_dialog = true;
 #endif
   if (can_show_network_diagnostics_dialog && failed_url.is_valid() &&
       failed_url.SchemeIsHTTPOrHTTPS()) {
@@ skipping 136 matching lines @@
     return l10n_util::GetStringUTF16(IDS_ERRORPAGES_DETAILS_UNKNOWN);
 }
 
 bool LocalizedError::HasStrings(const std::string& error_domain,
                                 int error_code) {
   // Whether or not the there are strings for an error does not depend on
   // whether or not the page was be generated by a POST, so just claim it was
   // not.
   return LookupErrorMap(error_domain, error_code, /*is_post=*/false) != NULL;
 }