Use IpcVideoFrameCapturer on network thread instead of capturer thread.

remoting/host/win/session_desktop_environment.cc

Index: remoting/host/win/session_desktop_environment.cc
diff --git a/remoting/host/win/session_desktop_environment.cc b/remoting/host/win/session_desktop_environment.cc
index 045562f1ad57509b8a3a0008d27860ffc4cc6f41..9d9f8b2ba371604a742f5f7e344a8bef4563d047 100644
--- a/remoting/host/win/session_desktop_environment.cc
+++ b/remoting/host/win/session_desktop_environment.cc
@@ -29,40 +29,43 @@ scoped_ptr<InputInjector> SessionDesktopEnvironment::CreateInputInjector() {
 
 SessionDesktopEnvironment::SessionDesktopEnvironment(
     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,
     const base::Closure& inject_sas,
     bool supports_touch_events)
     : Me2MeDesktopEnvironment(caller_task_runner,
+                              video_capture_task_runner,
                               input_task_runner,
                               ui_task_runner,
                               supports_touch_events),
-      inject_sas_(inject_sas) {
-}
+      inject_sas_(inject_sas) {}
 
 SessionDesktopEnvironmentFactory::SessionDesktopEnvironmentFactory(
     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,
     const base::Closure& inject_sas)
     : Me2MeDesktopEnvironmentFactory(caller_task_runner,
+                                     video_capture_task_runner,
                                      input_task_runner,
                                      ui_task_runner),
       inject_sas_(inject_sas) {
   DCHECK(caller_task_runner->BelongsToCurrentThread());
 }
 
-SessionDesktopEnvironmentFactory::~SessionDesktopEnvironmentFactory() {
-}
+SessionDesktopEnvironmentFactory::~SessionDesktopEnvironmentFactory() {}
 
 scoped_ptr<DesktopEnvironment> SessionDesktopEnvironmentFactory::Create(
     base::WeakPtr<ClientSessionControl> client_session_control) {
   DCHECK(caller_task_runner()->BelongsToCurrentThread());
 
   scoped_ptr<SessionDesktopEnvironment> desktop_environment(
-      new SessionDesktopEnvironment(caller_task_runner(), input_task_runner(),
-                                    ui_task_runner(), inject_sas_,
-                                    supports_touch_events()));
+      new SessionDesktopEnvironment(caller_task_runner(),
+                                    video_capture_task_runner(),
+                                    input_task_runner(), ui_task_runner(),
+                                    inject_sas_, supports_touch_events()));
   if (!desktop_environment->InitializeSecurity(client_session_control,
                                                curtain_enabled())) {
     return nullptr;