Add a ResourceScheduler to ResourceDispatcherHost.

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/process.h"
 #include "base/shared_memory.h"
 #include "content/common/content_param_traits_macros.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 "webkit/glue/resource_request_body.h"
 
 #ifndef CONTENT_COMMON_RESOURCE_MESSAGES_H_
 #define CONTENT_COMMON_RESOURCE_MESSAGES_H_
 
 namespace webkit_glue {
 struct ResourceDevToolsInfo;
 struct ResourceLoadTimingInfo;
 }
 
@@ skipping 114 matching lines @@
 
   // Process ID from which this request originated, or zero if it originated
   // in the renderer itself.
   IPC_STRUCT_MEMBER(int, origin_pid)
 
   // What this resource load is for (main frame, sub-frame, sub-resource,
   // object).
   IPC_STRUCT_MEMBER(ResourceType::Type, resource_type)
 
   // The priority of this request.
-  IPC_STRUCT_MEMBER(WebKit::WebURLRequest::Priority, priority)
+  IPC_STRUCT_MEMBER(net::RequestPriority, priority)
 
   // Used by plugin->browser requests to get the correct net::URLRequestContext.
   IPC_STRUCT_MEMBER(uint32, request_context)
 
   // Indicates which frame (or worker context) the request is being loaded into,
   // or kNoHostId.
   IPC_STRUCT_MEMBER(int, appcache_host_id)
 
   // Optional resource request body (may be null).
   IPC_STRUCT_MEMBER(scoped_refptr<webkit_glue::ResourceRequestBody>,
@@ skipping 132 matching lines @@
                     int /* request_id */)
 
 // Sent by the renderer process to acknowledge receipt of a
 // UploadProgress message.
 IPC_MESSAGE_ROUTED1(ResourceHostMsg_UploadProgress_ACK,
                     int /* request_id */)
 
 // 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_ROUTED2(ResourceHostMsg_DidChangePriority,
+                    int /* request_id */,
+                    net::RequestPriority)