Chromoting to report roundtrip latency

remoting/client/plugin/chromoting_scriptable_object.cc

Index: remoting/client/plugin/chromoting_scriptable_object.cc
diff --git a/remoting/client/plugin/chromoting_scriptable_object.cc b/remoting/client/plugin/chromoting_scriptable_object.cc
index 714be1f0307a5a9e71cc02d19a96c93e1cd53a83..aa653e9fbf38e2852c1729c643fcc45e3e086654 100644
--- a/remoting/client/plugin/chromoting_scriptable_object.cc
+++ b/remoting/client/plugin/chromoting_scriptable_object.cc
@@ -32,6 +32,7 @@ const char kVideoCaptureLatencyAttribute[] = "videoCaptureLatency";
 const char kVideoEncodeLatencyAttribute[] = "videoEncodeLatency";
 const char kVideoDecodeLatencyAttribute[] = "videoDecodeLatency";
 const char kVideoRenderLatencyAttribute[] = "videoRenderLatency";
+const char kRoundTripLatencyAttribute[] = "roundTripLatency";
 
 }  // namespace
 
@@ -81,6 +82,7 @@ void ChromotingScriptableObject::Init() {
   AddAttribute(kVideoEncodeLatencyAttribute, Var());
   AddAttribute(kVideoDecodeLatencyAttribute, Var());
   AddAttribute(kVideoRenderLatencyAttribute, Var());
+  AddAttribute(kRoundTripLatencyAttribute, Var());
 
   AddMethod("connect", &ChromotingScriptableObject::DoConnect);
   AddMethod("connectSandboxed",
@@ -151,6 +153,8 @@ Var ChromotingScriptableObject::GetProperty(const Var& name, Var* exception) {
     return instance_->GetStats()->video_decode_ms()->Average();
   if (name.AsString() == kVideoRenderLatencyAttribute)
     return instance_->GetStats()->video_paint_ms()->Average();
+  if (name.AsString() == kRoundTripLatencyAttribute)
+    return instance_->GetStats()->round_trip_ms()->Average();
 
   // TODO(ajwong): This incorrectly return a null object if a function
   // property is requested.