Chromoting to report roundtrip latency

remoting/host/screen_recorder.h

Index: remoting/host/screen_recorder.h
diff --git a/remoting/host/screen_recorder.h b/remoting/host/screen_recorder.h
index 79eacc760ab48ca6d661150a320aea07ae14732e..5d1a39e3e1b2692c5c166f9334dc64e2f25fe771 100644
--- a/remoting/host/screen_recorder.h
+++ b/remoting/host/screen_recorder.h
@@ -11,7 +11,6 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
-#include "base/scoped_ptr.h"
 #include "base/time.h"
 #include "base/timer.h"
 #include "remoting/base/encoder.h"
@@ -104,6 +103,9 @@ class ScreenRecorder : public base::RefCountedThreadSafe<ScreenRecorder> {
   // Remove all connections.
   void RemoveAllConnections();
 
+  // Update the sequence number for tracing performance.
+  void UpdateSequenceNumber(int64 sequence_number);
+
  private:
   // Getters for capturer and encoder.
   Capturer* capturer();
@@ -202,6 +204,9 @@ class ScreenRecorder : public base::RefCountedThreadSafe<ScreenRecorder> {
   // Time when encode is started.
   base::Time encode_start_time_;
 
+  // This is a number updated by client to trace performance.
+  int64 sequence_number_;
+
   DISALLOW_COPY_AND_ASSIGN(ScreenRecorder);
 };