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

content/shell/browser/shell_devtools_frontend.h

Index: content/shell/browser/shell_devtools_frontend.h
diff --git a/content/shell/browser/shell_devtools_frontend.h b/content/shell/browser/shell_devtools_frontend.h
index 95325e9e625f321c2c4145a817b2ee5a4df2851e..cfad44f4ece9c788ca387a03329562695ab6ef5c 100644
--- a/content/shell/browser/shell_devtools_frontend.h
+++ b/content/shell/browser/shell_devtools_frontend.h
@@ -65,7 +65,8 @@ class ShellDevToolsFrontend : public WebContentsObserver,
   Shell* frontend_shell_;
   scoped_refptr<DevToolsAgentHost> agent_host_;
   scoped_ptr<DevToolsFrontendHost> frontend_host_;
-  using PendingRequestsMap = std::map<const net::URLFetcher*, int>;
+  using PendingRequestsMap =
+      std::map<const net::URLFetcher*, std::pair<int, int>>;
   PendingRequestsMap pending_requests_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellDevToolsFrontend);