DevTools: response writers need to post to the UI while sending into streams.

chrome/browser/devtools/devtools_ui_bindings.h

 // Copyright 2014 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 CHROME_BROWSER_DEVTOOLS_DEVTOOLS_UI_BINDINGS_H_
 #define CHROME_BROWSER_DEVTOOLS_DEVTOOLS_UI_BINDINGS_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 198 matching lines @@
       scoped_refptr<DevToolsFileSystemIndexer::FileSystemIndexingJob> >
       IndexingJobsMap;
   IndexingJobsMap indexing_jobs_;
 
   bool device_count_updates_enabled_;
   bool devices_updates_enabled_;
   bool frontend_loaded_;
   scoped_ptr<DevToolsTargetsUIHandler> remote_targets_handler_;
   scoped_ptr<DevToolsEmbedderMessageDispatcher> embedder_message_dispatcher_;
   GURL url_;
-  using PendingRequestsMap = std::map<const net::URLFetcher*, int>;
+  using PendingRequestsMap =
+      std::map<const net::URLFetcher*, std::pair<int, int>>;
   PendingRequestsMap pending_requests_;
   base::WeakPtrFactory<DevToolsUIBindings> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DevToolsUIBindings);
 };
 
 #endif  // CHROME_BROWSER_DEVTOOLS_DEVTOOLS_UI_BINDINGS_H_