Enable tab discarding on Mac (behind a flag).

chrome/common/url_constants.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/url_constants.h"
 
 #include <algorithm>
 
 #include "base/basictypes.h"
 #include "content/public/common/url_constants.h"
@@ skipping 129 matching lines @@
 #endif
 
 #if defined(ENABLE_WEBRTC)
 const char kChromeUIWebRtcLogsURL[] = "chrome://webrtc-logs/";
 #endif
 
 #if defined(ENABLE_MEDIA_ROUTER)
 const char kChromeUIMediaRouterURL[] = "chrome://media-router/";
 #endif
 
-#if defined(OS_WIN) || defined(OS_CHROMEOS)
+#if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_CHROMEOS)
 const char kChromeUIDiscardsHost[] = "discards";
 const char kChromeUIDiscardsURL[] = "chrome://discards/";
 #endif
 
 // Add Chrome UI hosts here, in alphabetical order.
 // Add hosts to kChromePaths in browser_about_handler.cc to be listed by
 // chrome://chrome-urls (about:about) and the built-in AutocompleteProvider.
 const char kChromeUIAboutHost[] = "about";
 const char kChromeUIBlankHost[] = "blank";
 const char kChromeUIAppLauncherPageHost[] = "apps";
@@ skipping 571 matching lines @@
     "https://support.google.com/chrome/?p=ui_mac_32bit_support";
 #else
     "";
 #endif
 #endif
 
 const char kEasyUnlockLearnMoreUrl[] =
     "https://support.google.com/chromebook/?p=smart_lock";
 
 }  // namespace chrome