Consistently use LoFi for an entire page

content/common/resource_messages.h

 // 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.
 
 // IPC messages for resource loading.
 //
 // NOTE: All messages must send an |int request_id| as their first parameter.
 
 // Multiply-included message file, hence no include guard.
 #include "base/memory/shared_memory.h"
 #include "base/process/process.h"
 #include "content/common/content_param_traits_macros.h"
+#include "content/common/navigation_params.h"
 #include "content/common/resource_request_body.h"
 #include "content/common/service_worker/service_worker_types.h"
 #include "content/public/common/common_param_traits.h"
 #include "content/public/common/resource_response.h"
 #include "ipc/ipc_message_macros.h"
 #include "net/base/request_priority.h"
 #include "net/http/http_response_info.h"
 #include "net/url_request/redirect_info.h"
 
 #ifndef CONTENT_COMMON_RESOURCE_MESSAGES_H_
@@ skipping 105 matching lines @@
   IPC_STRUCT_TRAITS_MEMBER(was_fetched_via_proxy)
   IPC_STRUCT_TRAITS_MEMBER(npn_negotiated_protocol)
   IPC_STRUCT_TRAITS_MEMBER(socket_address)
   IPC_STRUCT_TRAITS_MEMBER(was_fetched_via_service_worker)
   IPC_STRUCT_TRAITS_MEMBER(was_fallback_required_by_service_worker)
   IPC_STRUCT_TRAITS_MEMBER(original_url_via_service_worker)
   IPC_STRUCT_TRAITS_MEMBER(response_type_via_service_worker)
   IPC_STRUCT_TRAITS_MEMBER(service_worker_start_time)
   IPC_STRUCT_TRAITS_MEMBER(service_worker_ready_time)
   IPC_STRUCT_TRAITS_MEMBER(proxy_server)
+  IPC_STRUCT_TRAITS_MEMBER(is_lofi)
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_TRAITS_BEGIN(net::RedirectInfo)
   IPC_STRUCT_TRAITS_MEMBER(status_code)
   IPC_STRUCT_TRAITS_MEMBER(new_method)
   IPC_STRUCT_TRAITS_MEMBER(new_url)
   IPC_STRUCT_TRAITS_MEMBER(new_first_party_for_cookies)
   IPC_STRUCT_TRAITS_MEMBER(new_referrer)
 IPC_STRUCT_TRAITS_END()
 
@@ skipping 112 matching lines @@
 
   // The following two members identify a previous request that has been
   // created before this navigation has been transferred to a new render view.
   // This serves the purpose of recycling the old request.
   // Unless this refers to a transferred navigation, these values are -1 and -1.
   IPC_STRUCT_MEMBER(int, transferred_request_child_id)
   IPC_STRUCT_MEMBER(int, transferred_request_request_id)
 
   // Whether or not we should allow the URL to download.
   IPC_STRUCT_MEMBER(bool, allow_download)
+
+  // Whether or not to request a LoFi version of the resource or let the browser
+  // decide.
+  IPC_STRUCT_MEMBER(int, lofi_state)

[davidben, 2015/08/27 18:53:50]

This needs to be an enum, not an int. The IPC logic should also ensure thath
invalid enum values are discarded. (nasko would know more about this.)

[megjablon, 2015/08/27 23:11:02]

Is there a way for an IPC struct to have enums? I couldn't figure out a way to
do this.

[megjablon, 2015/09/09 20:54:16]

Done.

 IPC_STRUCT_END()
 
 // Parameters for a ResourceMsg_RequestComplete
 IPC_STRUCT_BEGIN(ResourceMsg_RequestCompleteData)
   // The error code.
   IPC_STRUCT_MEMBER(int, error_code)
 
   // Was ignored by the request handler.
   IPC_STRUCT_MEMBER(bool, was_ignored_by_handler)
 
@@ skipping 114 matching lines @@
 
 // Sent when the renderer process deletes a resource loader.
 IPC_MESSAGE_CONTROL1(ResourceHostMsg_ReleaseDownloadedFile,
                      int /* request_id */)
 
 // Sent by the renderer when a resource request changes priority.
 IPC_MESSAGE_CONTROL3(ResourceHostMsg_DidChangePriority,
                      int /* request_id */,
                      net::RequestPriority,
                      int /* intra_priority_value */)