Add option to disallow the discarding of a tab that was previously discarded.

chrome/browser/ui/webui/about_ui.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/ui/webui/about_ui.h"
 
 #include <algorithm>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 511 matching lines @@
     str += "</b>";
     str += net::EscapeForHTML(base::UTF16ToUTF8(it->title));
 #if defined(OS_CHROMEOS)
     str += base::StringPrintf(" (%d) ", it->oom_score);
 #endif
     if (!it->is_discarded) {
       str += base::StringPrintf(" <a href='%s%s/%" PRId64 "'>Discard</a>",
                                 chrome::kChromeUIDiscardsURL,
                                 kAboutDiscardsRunCommand, it->tab_contents_id);
     }
+    str += base::StringPrintf("&nbsp;&nbsp;(%d discards this session)",
+                              it->discard_count);
     titles.push_back(str);
   }
   return titles;
 }
 
 std::string AboutDiscards(const std::string& path) {
   std::string output;
   int64 web_content_id;
   memory::OomPriorityManager* oom = g_browser_process->GetOomPriorityManager();
 
@@ skipping 486 matching lines @@
   Profile* profile = Profile::FromWebUI(web_ui);
 
 #if defined(ENABLE_THEMES)
   // Set up the chrome://theme/ source.
   ThemeSource* theme = new ThemeSource(profile);
   content::URLDataSource::Add(profile, theme);
 #endif
 
   content::URLDataSource::Add(profile, new AboutUIHTMLSource(name, profile));
 }