Implement a dummy host to do capturing and analysis only.

remoting/protocol/fake_connection_to_client.cc

Index: remoting/protocol/fake_connection_to_client.cc
diff --git a/remoting/protocol/fake_connection_to_client.cc b/remoting/protocol/fake_connection_to_client.cc
index 8d115f5a38255e8fa32987b77eb747464fe04861..6c622d884ef7095df39d2c15b50647de5ff2db2e 100644
--- a/remoting/protocol/fake_connection_to_client.cc
+++ b/remoting/protocol/fake_connection_to_client.cc
@@ -6,7 +6,9 @@
 
 #include <utility>
 
+#include "remoting/codec/video_encoder.h"
 #include "remoting/protocol/session.h"
+#include "remoting/protocol/video_frame_pump.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_capturer.h"
 
 namespace remoting {
@@ -42,6 +44,19 @@ void FakeConnectionToClient::SetEventHandler(EventHandler* event_handler) {
 
 std::unique_ptr<VideoStream> FakeConnectionToClient::StartVideoStream(
     std::unique_ptr<webrtc::DesktopCapturer> desktop_capturer) {
+  if (video_stub_ && video_encode_task_runner_) {

[joedow, 2016/04/28 22:53:54]

Should it be an error if you have one but not the other?  Maybe they should be
set together to set the 'mode' i.e. use the VideoFramePump or use the
FakeVideoStream.

[Hzj_jie, 2016/05/03 19:07:05]

It's a good point, indeed I have not thought about it. Is there any possibility
one of these two can combine with another parameters to impact some other
behavior?

+    std::unique_ptr<VideoEncoder> video_encoder =
+        VideoEncoder::Create(session_->config());
+
+    std::unique_ptr<protocol::VideoFramePump> pump(
+        new protocol::VideoFramePump(video_encode_task_runner_,
+                                     std::move(desktop_capturer),
+                                     std::move(video_encoder),
+                                     video_stub_));
+    video_feedback_stub_ = pump->video_feedback_stub();
+    return std::move(pump);
+  }
+
   std::unique_ptr<FakeVideoStream> result(new FakeVideoStream());
   last_video_stream_ = result->GetWeakPtr();
   return std::move(result);