Use IpcVideoFrameCapturer on network thread instead of capturer thread.

remoting/host/basic_desktop_environment.cc

Index: remoting/host/basic_desktop_environment.cc
diff --git a/remoting/host/basic_desktop_environment.cc b/remoting/host/basic_desktop_environment.cc
index b65018e8bc82ae6093037a805425b0014aaf193b..cdaadf04dce153a2f601b5a0e39b57996883256c 100644
--- a/remoting/host/basic_desktop_environment.cc
+++ b/remoting/host/basic_desktop_environment.cc
@@ -10,7 +10,9 @@
 #include "build/build_config.h"
 #include "remoting/host/audio_capturer.h"
 #include "remoting/host/client_session_control.h"
+#include "remoting/host/desktop_capturer_proxy.h"
 #include "remoting/host/input_injector.h"
+#include "remoting/host/mouse_cursor_monitor_proxy.h"
 #include "remoting/host/screen_controls.h"
 #include "remoting/host/security_key/gnubby_auth_handler.h"
 #include "remoting/protocol/capability_names.h"
@@ -52,12 +54,16 @@ scoped_ptr<ScreenControls> BasicDesktopEnvironment::CreateScreenControls() {
 
 scoped_ptr<webrtc::MouseCursorMonitor>
 BasicDesktopEnvironment::CreateMouseCursorMonitor() {
+  scoped_ptr<webrtc::MouseCursorMonitor> cursor_monitor;
+
 #if defined(OS_CHROMEOS)
-  return make_scoped_ptr(new MouseCursorMonitorAura());
+  cursor_monitor.reset(new MouseCursorMonitorAura());
 #else
-  return make_scoped_ptr(webrtc::MouseCursorMonitor::CreateForScreen(
+  cursor_monitor.reset(webrtc::MouseCursorMonitor::CreateForScreen(
       *desktop_capture_options_, webrtc::kFullDesktopScreenId));
 #endif
+  return make_scoped_ptr(new MouseCursorMonitorProxy(
+      video_capture_task_runner_, std::move(cursor_monitor)));
 }
 
 std::string BasicDesktopEnvironment::GetCapabilities() const {
@@ -79,27 +85,30 @@ scoped_ptr<webrtc::DesktopCapturer>
 BasicDesktopEnvironment::CreateVideoCapturer() {
   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 
+  scoped_ptr<webrtc::DesktopCapturer> capturer;
+
 #if defined(OS_CHROMEOS)
-  return scoped_ptr<webrtc::DesktopCapturer>(new AuraDesktopCapturer());
+  capturer.reset(new AuraDesktopCapturer());
 #else  // !defined(OS_CHROMEOS)
-  // The basic desktop environment does not use X DAMAGE, since it is
-  // broken on many systems - see http://crbug.com/73423.
-  return make_scoped_ptr(
-      webrtc::ScreenCapturer::Create(*desktop_capture_options_));
+  capturer.reset(webrtc::ScreenCapturer::Create(*desktop_capture_options_));
 #endif  // !defined(OS_CHROMEOS)
+
+  return make_scoped_ptr(new DesktopCapturerProxy(video_capture_task_runner_,
+                                                  std::move(capturer)));
 }
 
 BasicDesktopEnvironment::BasicDesktopEnvironment(
     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,
     bool supports_touch_events)
     : caller_task_runner_(caller_task_runner),
+      video_capture_task_runner_(video_capture_task_runner),
       input_task_runner_(input_task_runner),
       ui_task_runner_(ui_task_runner),
-      desktop_capture_options_(
-          new webrtc::DesktopCaptureOptions(
-              webrtc::DesktopCaptureOptions::CreateDefault())),
+      desktop_capture_options_(new webrtc::DesktopCaptureOptions(
+          webrtc::DesktopCaptureOptions::CreateDefault())),
       supports_touch_events_(supports_touch_events) {
   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 #if defined(USE_X11)
@@ -109,16 +118,16 @@ BasicDesktopEnvironment::BasicDesktopEnvironment(
 
 BasicDesktopEnvironmentFactory::BasicDesktopEnvironmentFactory(
     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)
     : caller_task_runner_(caller_task_runner),
+      video_capture_task_runner_(video_capture_task_runner),
       input_task_runner_(input_task_runner),
       ui_task_runner_(ui_task_runner),
-      supports_touch_events_(false) {
-}
+      supports_touch_events_(false) {}
 
-BasicDesktopEnvironmentFactory::~BasicDesktopEnvironmentFactory() {
-}
+BasicDesktopEnvironmentFactory::~BasicDesktopEnvironmentFactory() {}
 
 bool BasicDesktopEnvironmentFactory::SupportsAudioCapture() const {
   DCHECK(caller_task_runner_->BelongsToCurrentThread());