Use IpcVideoFrameCapturer on network thread instead of capturer thread.

remoting/host/it2me_desktop_environment.h

 // Copyright 2013 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 REMOTING_HOST_IT2ME_DESKTOP_ENVIRONMENT_H_
 #define REMOTING_HOST_IT2ME_DESKTOP_ENVIRONMENT_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "remoting/host/basic_desktop_environment.h"
 
 namespace remoting {
 
 class HostWindow;
 class LocalInputMonitor;
 
 // Same as BasicDesktopEnvironment but also presents the Continue window to
 // the local user.
 class It2MeDesktopEnvironment : public BasicDesktopEnvironment {
  public:
   ~It2MeDesktopEnvironment() override;
 
  protected:
   friend class It2MeDesktopEnvironmentFactory;
   It2MeDesktopEnvironment(
       scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner,
+      scoped_refptr<base::SingleThreadTaskRunner> video_capture_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> input_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
       base::WeakPtr<ClientSessionControl> client_session_control,
       bool supports_touch_events);
 
  private:
   // Presents the continue window to the local user.
   scoped_ptr<HostWindow> continue_window_;
 
   // Presents the disconnect window to the local user.
   scoped_ptr<HostWindow> disconnect_window_;
 
   // Notifies the client session about the local mouse movements.
   scoped_ptr<LocalInputMonitor> local_input_monitor_;
 
   DISALLOW_COPY_AND_ASSIGN(It2MeDesktopEnvironment);
 };
 
 // Used to create |It2MeDesktopEnvironment| instances.
 class It2MeDesktopEnvironmentFactory : public BasicDesktopEnvironmentFactory {
  public:
   It2MeDesktopEnvironmentFactory(
       scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner,
+      scoped_refptr<base::SingleThreadTaskRunner> video_capture_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> input_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner);
   ~It2MeDesktopEnvironmentFactory() override;
 
   // DesktopEnvironmentFactory interface.
   scoped_ptr<DesktopEnvironment> Create(
       base::WeakPtr<ClientSessionControl> client_session_control) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(It2MeDesktopEnvironmentFactory);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_IT2ME_DESKTOP_ENVIRONMENT_H_