PlzNavigate: AppCache support.

content/renderer/render_frame_impl.h

 // Copyright 2013 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.
 
 #ifndef CONTENT_RENDERER_RENDER_FRAME_IMPL_H_
 #define CONTENT_RENDERER_RENDER_FRAME_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 1312 matching lines @@
   AssociatedInterfaceRegistryImpl associated_interfaces_;
   std::unique_ptr<AssociatedInterfaceProviderImpl>
       remote_associated_interfaces_;
 
   // TODO(dcheng): Remove these members.
   bool committed_first_load_ = false;
   bool name_changed_before_first_commit_ = false;
 
   bool browser_side_navigation_pending_ = false;
 
+  // PlzNavigte: The host id to be used by the AppCache system. Defaults to 0.
+  int appcache_host_id_;
+
   base::WeakPtrFactory<RenderFrameImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_FRAME_IMPL_H_