Add support for passing an arbitrary parameter to an IPC message handler. The motivation is for Web…

content/browser/renderer_host/render_message_filter.cc

 // 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.
 
 #include "content/browser/renderer_host/render_message_filter.h"
 
 #include <map>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 863 matching lines @@
       media::AudioManagerBase::kDefaultDeviceId);
 }
 
 #if defined(OS_WIN)
 void RenderMessageFilter::OnGetMonitorColorProfile(std::vector<char>* profile) {
   DCHECK(!BrowserThread::CurrentlyOn(BrowserThread::IO));
   *profile = g_color_profile.Get().profile();
 }
 #endif
 
-void RenderMessageFilter::OnDownloadUrl(const IPC::Message& message,
+void RenderMessageFilter::OnDownloadUrl(int render_view_id,
                                         const GURL& url,
                                         const Referrer& referrer,
                                         const base::string16& suggested_name,
                                         const bool use_prompt) {
   scoped_ptr<DownloadSaveInfo> save_info(new DownloadSaveInfo());
   save_info->suggested_name = suggested_name;
   save_info->prompt_for_save_location = use_prompt;
 
   // There may be a special cookie store that we could use for this download,
   // rather than the default one. Since this feature is generally only used for
   // proper render views, and not downloads, we do not need to retrieve the
   // special cookie store here, but just initialize the request to use the
   // default cookie store.
   // TODO(tburkard): retrieve the appropriate special cookie store, if this
   // is ever to be used for downloads as well.
   scoped_ptr<net::URLRequest> request(
       resource_context_->GetRequestContext()->CreateRequest(
           url, net::DEFAULT_PRIORITY, NULL, NULL));
   RecordDownloadSource(INITIATED_BY_RENDERER);
   resource_dispatcher_host_->BeginDownload(
       request.Pass(),
       referrer,
       true,  // is_content_initiated
       resource_context_,
       render_process_id_,
-      message.routing_id(),
+      render_view_id,
       false,
       save_info.Pass(),
       content::DownloadItem::kInvalidId,
       ResourceDispatcherHostImpl::DownloadStartedCallback());
 }
 
 void RenderMessageFilter::OnCheckNotificationPermission(
     const GURL& source_origin, int* result) {
 #if defined(ENABLE_NOTIFICATIONS)
   *result = GetContentClient()->browser()->
@@ skipping 396 matching lines @@
       return;
     }
   }
 #endif
 
   GpuMemoryBufferImpl::AllocateForChildProcess(
       gfx::Size(width, height), internalformat, usage, PeerHandle(), handle);
 }
 
 }  // namespace content