Handle extension webrequest API on the IO thread. This speeds up blocking event

chrome/browser/extensions/extension_event_router.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 CHROME_BROWSER_EXTENSIONS_EXTENSION_EVENT_ROUTER_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_EVENT_ROUTER_H_
 #pragma once
 
 #include <map>
 #include <set>
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "content/common/notification_observer.h"
 #include "content/common/notification_registrar.h"
+#include "ipc/ipc_message.h"
 
 class GURL;
 class Extension;
 class ExtensionDevToolsManager;
 class Profile;
 class RenderProcessHost;
 
 class ExtensionEventRouter : public NotificationObserver {
  public:
-  // Returns true if the given extension can see events and data from another
-  // sub-profile (incognito to original profile, or vice versa).
-  static bool CanCrossIncognito(Profile* profile,
-                                const std::string& extension_id);
-  static bool CanCrossIncognito(Profile* profile, const Extension* extension);
+  // Sends an event via ipc_sender to the given extension. Can be called on
+  // any thread.
+  static void DispatchEvent(IPC::Message::Sender* ipc_sender,
+                            const std::string& extension_id,
+                            const std::string& event_name,
+                            const std::string& event_args,
+                            const GURL& event_url);
 
   explicit ExtensionEventRouter(Profile* profile);
   virtual ~ExtensionEventRouter();
 
   // Add or remove the process/extension pair as a listener for |event_name|.
   // Note that multiple extensions can share a process due to process
   // collapsing. Also, a single extension can have 2 processes if it is a split
   // mode extension.
   void AddEventListener(const std::string& event_name,
                         RenderProcessHost* process,
@@ skipping 49 matching lines @@
 
   // A map between an event name and a set of extensions that are listening
   // to that event.
   typedef std::map<std::string, std::set<EventListener> > ListenerMap;
   ListenerMap listeners_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionEventRouter);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_EVENT_ROUTER_H_