Use IpcVideoFrameCapturer on network thread instead of capturer thread.

remoting/host/single_window_desktop_environment.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 REMOTING_HOST_SINGLE_WINDOW_DESKTOP_ENVIRONMENT_H_
 #define REMOTING_HOST_SINGLE_WINDOW_DESKTOP_ENVIRONMENT_H_
 
 #include "base/macros.h"
 #include "remoting/host/basic_desktop_environment.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_capture_types.h"
 
 namespace remoting {
 
 // Passed to the ChromotingHost to remote an individual window's contents,
 // rather than a whole desktop.
 class SingleWindowDesktopEnvironmentFactory
     : public BasicDesktopEnvironmentFactory {
  public:
   SingleWindowDesktopEnvironmentFactory(
       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,
       webrtc::WindowId window_id);
   ~SingleWindowDesktopEnvironmentFactory() override;
 
   // DesktopEnvironmentFactory interface.
   scoped_ptr<DesktopEnvironment> Create(
       base::WeakPtr<ClientSessionControl> client_session_control) override;
 
  private:
   webrtc::WindowId window_id_;
 
   DISALLOW_COPY_AND_ASSIGN(SingleWindowDesktopEnvironmentFactory);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_SINGLE_WINDOW_DESKTOP_ENVIRONMENT_H_