Implement offline mode behind a flag

content/public/common/content_switches.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 "content/public/common/content_switches.h"
 
 namespace switches {
 
 // By default, file:// URIs cannot read other file:// URIs. This is an
 // override for developers who need the old behavior for testing.
@@ skipping 321 matching lines @@
 
 // On Windows, converts the page to the currently-installed monitor profile.
 // This does NOT enable color management for images. The source is still
 // assumed to be sRGB.
 const char kEnableMonitorProfile[]          = "enable-monitor-profile";
 
 // Enables compositor-accelerated touch-screen pinch gestures.
 const char kEnablePinch[]                   = "enable-pinch";
 const char kDisablePinch[]                  = "disable-pinch";
 
+// Enables use of cache if offline, even if it's stale
+const char kEnableOfflineCacheAccess[]      = "enable-offline-cache-access";
+
 // Enable caching of pre-parsed JS script data.  See http://crbug.com/32407.
 const char kEnablePreparsedJsCaching[]      = "enable-preparsed-js-caching";
 
 // Enable privileged WebGL extensions; without this switch such extensions are
 // available only to Chrome extensions.
 const char kEnablePrivilegedWebGLExtensions[] =
     "enable-privileged-webgl-extensions";
 
 // Aggressively free GPU command buffers belonging to hidden tabs.
 const char kEnablePruneGpuCommandBuffers[] =
@@ skipping 425 matching lines @@
 const char kEnableVsyncNotification[] = "enable-vsync-notification";
 
 // Enables history navigation in response to horizontal overscroll.
 const char kEnableOverscrollHistoryNavigation[] =
     "enable-overscroll-history-navigation";
 
 // Enables 'image/webp' accept header for image requests.
 const char kEnableWebPInAcceptHeader[] = "enable-webp-in-accept-header";
 
 }  // namespace switches