Enable tab discarding on Mac (behind a flag).

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 439 matching lines @@
       "<p>The following pages are for debugging purposes only. Because they "
       "crash or hang the renderer, they're not linked directly; you can type "
       "them into the address bar if you need them.</p>\n<ul>";
   for (int i = 0; i < chrome::kNumberOfChromeDebugURLs; i++)
     html += "<li>" + std::string(chrome::kChromeDebugURLs[i]) + "</li>\n";
   html += "</ul>\n";
   AppendFooter(&html);
   return html;
 }
 
-#if defined(OS_WIN) || defined(OS_CHROMEOS)
+#if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_CHROMEOS)
 
 const char kAboutDiscardsRunCommand[] = "run";
 
 // Html output helper functions
 
 // Helper function to wrap HTML with a tag.
 std::string WrapWithTag(const std::string& tag, const std::string& text) {
   return "<" + tag + ">" + text + "</" + tag + ">";
 }
-
+#if defined(OS_CHROMEOS)
 // Helper function to wrap Html with <td> tag.
 std::string WrapWithTD(const std::string& text) {
   return "<td>" + text + "</td>";
 }
 
 // Helper function to wrap Html with <tr> tag.
 std::string WrapWithTR(const std::string& text) {
   return "<tr>" + text + "</tr>";
 }
 
 std::string AddStringRow(const std::string& name, const std::string& value) {
   std::string row;
   row.append(WrapWithTD(name));
   row.append(WrapWithTD(value));
   return WrapWithTR(row);
 }
-
+#endif
 void AddContentSecurityPolicy(std::string* output) {
   output->append("<meta http-equiv='Content-Security-Policy' "
       "content='default-src 'none';'>");
 }
 
 // TODO(stevenjb): L10N AboutDiscards.
 
 std::string BuildAboutDiscardsRunPage() {
   std::string output;
   AppendHeader(&output, 0, "About discards");
@@ skipping 440 matching lines @@
     int idr = IDR_CREDITS_HTML;
     if (path == kCreditsJsPath)
       idr = IDR_CREDITS_JS;
 #if defined(OS_CHROMEOS)
     else if (path == kKeyboardUtilsPath)
       idr = IDR_KEYBOARD_UTILS_JS;
 #endif
 
     response = ResourceBundle::GetSharedInstance().GetRawDataResource(
         idr).as_string();
-#if defined(OS_WIN) || defined(OS_CHROMEOS)
+#if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_CHROMEOS)
   } else if (source_name_ == chrome::kChromeUIDiscardsHost) {
     response = AboutDiscards(path);
 #endif
   } else if (source_name_ == chrome::kChromeUIDNSHost) {
     AboutDnsHandler::Start(profile(), callback);
     return;
 #if defined(OS_LINUX) || defined(OS_OPENBSD)
   } else if (source_name_ == chrome::kChromeUILinuxProxyConfigHost) {
     response = AboutLinuxProxyConfig();
 #endif
@@ skipping 68 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));
 }