Allow URL requests for object/embed tags to be intercepted as streams.

content/browser/loader/resource_dispatcher_host_impl.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.
 
 // This is the browser side of the resource dispatcher, it receives requests
 // from the child process (i.e. [Renderer, Plugin, Worker]ProcessHost), and
 // dispatches them to URLRequests. It then forwards the messages from the
 // URLRequests back to the correct process for handling.
 //
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
@@ skipping 208 matching lines @@
   // dialog boxes.
   bool allow_cross_origin_auth_prompt();
 
   ResourceDispatcherHostDelegate* delegate() {
     return delegate_;
   }
 
   // Must be called after the ResourceRequestInfo has been created
   // and associated with the request.
   // |id| should be |content::DownloadItem::kInvalidId| to request automatic
-  // assignment.
-  scoped_ptr<ResourceHandler> CreateResourceHandlerForDownload(
+  // assignment. This is marked virtual so it can be overriden in testing.
+  virtual scoped_ptr<ResourceHandler> CreateResourceHandlerForDownload(
       net::URLRequest* request,
       bool is_content_initiated,
       bool must_download,
       uint32 id,
       scoped_ptr<DownloadSaveInfo> save_info,
       const DownloadUrlParameters::OnStartedCallback& started_cb);
 
   // Must be called after the ResourceRequestInfo has been created
   // and associated with the request.  If |payload| is set to a non-empty value,
   // the value will be sent to the old resource handler instead of canceling
-  // it, except on HTTP errors.
-  scoped_ptr<ResourceHandler> MaybeInterceptAsStream(
+  // it, except on HTTP errors. This is marked virtual so it can be overriden in
+  // testing.
+  virtual scoped_ptr<ResourceHandler> MaybeInterceptAsStream(
       net::URLRequest* request,
       ResourceResponse* response,
       std::string* payload);
 
   ResourceScheduler* scheduler() { return scheduler_.get(); }
 
   // Called by a ResourceHandler when it's ready to start reading data and
   // sending it to the renderer. Returns true if there are enough file
   // descriptors available for the shared memory buffer. If false is returned,
   // the request should cancel.
@@ skipping 295 matching lines @@
   DelegateMap delegate_map_;
 
   scoped_ptr<ResourceScheduler> scheduler_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceDispatcherHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_RESOURCE_DISPATCHER_HOST_IMPL_H_