Implement offline mode behind a flag

content/browser/loader/resource_dispatcher_host_impl.h

Index: content/browser/loader/resource_dispatcher_host_impl.h
diff --git a/content/browser/loader/resource_dispatcher_host_impl.h b/content/browser/loader/resource_dispatcher_host_impl.h
index 5dc36e643526406d43167a57b5fa4ce32b0ae6e0..3872c2aaace90bd9e0d44780a3c96e8a718d70fe 100644
--- a/content/browser/loader/resource_dispatcher_host_impl.h
+++ b/content/browser/loader/resource_dispatcher_host_impl.h
@@ -25,6 +25,7 @@
 #include "base/time.h"
 #include "base/timer.h"
 #include "content/browser/download/download_resource_handler.h"
+#include "content/browser/loader/offline_policy.h"
 #include "content/browser/loader/render_view_host_tracker.h"
 #include "content/browser/loader/resource_loader.h"
 #include "content/browser/loader/resource_loader_delegate.h"
@@ -452,6 +453,8 @@ class CONTENT_EXPORT ResourceDispatcherHostImpl
 
   RenderViewHostTracker tracker_;  // Lives on UI thread.
 
+  OfflinePolicy offline_policy_;
+
   DISALLOW_COPY_AND_ASSIGN(ResourceDispatcherHostImpl);
 };