Implement offline mode behind a flag

chrome/browser/about_flags.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/about_flags.h"
 
 #include <string.h>
 
 #include <algorithm>
 #include <iterator>
@@ skipping 1265 matching lines @@
     kOsAll,
     SINGLE_VALUE_TYPE(switches::kEnableExperimentalWebSocket)
   },
   {
     "max-tiles-for-interest-area",
     IDS_FLAGS_MAX_TILES_FOR_INTEREST_AREA_NAME,
     IDS_FLAGS_MAX_TILES_FOR_INTEREST_AREA_DESCRIPTION,
     kOsAndroid | kOsLinux | kOsCrOS,
     MULTI_VALUE_TYPE(kMaxTilesForInterestAreaChoices)
   },
+  {
+    "enable-offline-mode",
+    IDS_FLAGS_ENABLE_OFFLINE_MODE_NAME,
+    IDS_FLAGS_ENABLE_OFFLINE_MODE_DESCRIPTION,
+    kOsAll,
+    SINGLE_VALUE_TYPE(switches::kEnableOfflineCacheAccess)
+  },
   // TODO(sky): ifdef needed until focus sorted out in DesktopNativeWidgetAura.
 #if !defined(USE_AURA)
   {
     "track-active-visit-time",
     IDS_FLAGS_TRACK_ACTIVE_VISIT_TIME_NAME,
     IDS_FLAGS_TRACK_ACTIVE_VISIT_TIME_DESCRIPTION,
     kOsWin,
     SINGLE_VALUE_TYPE(switches::kTrackActiveVisitTime)
   },
 #endif
@@ skipping 563 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags