Factor out dependncy on download throttling from core download code.

content/browser/renderer_host/resource_dispatcher_host_delegate.h

 // Copyright (c) 2011 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_BROWSER_RENDERER_HOST_RESOURCE_DISPATCHER_HOST_DELEGATE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RESOURCE_DISPATCHER_HOST_DELEGATE_H_
 #pragma once
 
 #include <string>
 
 #include "base/basictypes.h"
 
 class GURL;
 class ResourceDispatcherHostLoginDelegate;
 class ResourceHandler;
 class ResourceMessageFilter;
+class TabContents;
 struct ResourceHostMsg_Request;
 struct ResourceResponse;
 
 namespace content {
 class ResourceContext;
 }
 
 namespace net {
 class AuthChallengeInfo;
 class SSLCertRequestInfo;
@@ skipping 16 matching lines @@
   // a new handler that is chained to the given one, otherwise just reutrn the
   // given handler.
   virtual ResourceHandler* RequestBeginning(
       ResourceHandler* handler,
       net::URLRequest* request,
       const content::ResourceContext& resource_context,
       bool is_subresource,
       int child_id,
       int route_id) = 0;
 
-  // Called when a download is starting, after the resource handles from the
-  // content layer have been added.
+  // Allows an embedder to add additional resource handlers for a download.
+  // |is_new_request| is true if this is a request that is just starting, i.e.
+  // the content layer has just added its own resource handlers; it's false if
+  // this was originally a non-download request that had some resource handlers
+  // applied already and now we found out it's a download.
+  // |in_complete| is true if this is invoked from |OnResponseCompleted|.
   virtual ResourceHandler* DownloadStarting(
       ResourceHandler* handler,
       const content::ResourceContext& resource_context,
+      net::URLRequest* request,
       int child_id,
-      int route_id) = 0;
+      int route_id,
+      int request_id,
+      bool is_new_request,
+      bool in_complete) = 0;
 
   // Called to determine whether a request's start should be deferred. This
   // is only called if the ResourceHandler associated with the request does
   // not ask for a deferral. A return value of true will defer the start of
   // the request, false will continue the request.
   virtual bool ShouldDeferStart(
       net::URLRequest* request,
       const content::ResourceContext& resource_context) = 0;
 
   // Called when an SSL Client Certificate is requested. If false is returned,
@@ skipping 35 matching lines @@
       net::URLRequest* request,
       ResourceResponse* response,
       ResourceMessageFilter* filter) = 0;
 
  protected:
    ResourceDispatcherHostDelegate() {}
    virtual ~ResourceDispatcherHostDelegate() {}
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RESOURCE_DISPATCHER_HOST_DELEGATE_H_