Experiment for the nack module.

webrtc/modules/video_coding/jitter_buffer.h

Index: webrtc/modules/video_coding/jitter_buffer.h
diff --git a/webrtc/modules/video_coding/jitter_buffer.h b/webrtc/modules/video_coding/jitter_buffer.h
index 8ba338f0c7bbc522ab9b0b48c6c844826d047596..149d3a109f28d17bb65664f1e61545d7f6cf2047 100644
--- a/webrtc/modules/video_coding/jitter_buffer.h
+++ b/webrtc/modules/video_coding/jitter_buffer.h
@@ -20,12 +20,14 @@
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/base/thread_annotations.h"
 #include "webrtc/modules/include/module_common_types.h"
+#include "webrtc/modules/utility/include/process_thread.h"
 #include "webrtc/modules/video_coding/include/video_coding.h"
 #include "webrtc/modules/video_coding/include/video_coding_defines.h"
 #include "webrtc/modules/video_coding/decoding_state.h"
 #include "webrtc/modules/video_coding/inter_frame_delay.h"
 #include "webrtc/modules/video_coding/jitter_buffer_common.h"
 #include "webrtc/modules/video_coding/jitter_estimator.h"
+#include "webrtc/modules/video_coding/nack_module.h"
 #include "webrtc/system_wrappers/include/critical_section_wrapper.h"
 #include "webrtc/typedefs.h"
 
@@ -104,7 +106,11 @@ class Vp9SsMap {
 
 class VCMJitterBuffer {
  public:
-  VCMJitterBuffer(Clock* clock, std::unique_ptr<EventWrapper> event);
+  VCMJitterBuffer(Clock* clock,
+                  std::unique_ptr<EventWrapper> event,
+                  ProcessThread* module_process_thread = nullptr,
+                  NackSender* nack_sender = nullptr,
+                  KeyFrameRequestSender* keyframe_request_sender = nullptr);
 
   ~VCMJitterBuffer();
 
@@ -383,6 +389,10 @@ class VCMJitterBuffer {
   // average_packets_per_frame converges fast if we have fewer than this many
   // frames.
   int frame_counter_;
+
+  ProcessThread* module_process_thread_;
+  std::unique_ptr<NackModule> nack_module_;
+
   RTC_DISALLOW_COPY_AND_ASSIGN(VCMJitterBuffer);
 };
 }  // namespace webrtc