Report better error message on update sandbox for gn builds

media/cast/sender/frame_sender.cc

Index: media/cast/sender/frame_sender.cc
diff --git a/media/cast/sender/frame_sender.cc b/media/cast/sender/frame_sender.cc
index a7d9a27cb60906d68bbfe93f18a98d7047bbc31a..c56c560e879ca50b39db99210f4ef7971ee2d830 100644
--- a/media/cast/sender/frame_sender.cc
+++ b/media/cast/sender/frame_sender.cc
@@ -260,6 +260,12 @@ void FrameSender::SendEncodedFrame(
     encoded_frame->new_playout_delay_ms =
         target_playout_delay_.InMilliseconds();
   }
+
+  TRACE_EVENT_ASYNC_BEGIN2("cast.stream",
+      is_audio_ ? "Audio Transport" : "Video Transport",
+      frame_id,
+      "timestamp", encoded_frame->reference_time.ToInternalValue(),
+      "rtp_timestamp", encoded_frame->rtp_timestamp);
   transport_sender_->InsertFrame(ssrc_, *encoded_frame);
 }
 
@@ -299,6 +305,10 @@ void FrameSender::OnReceivedCastFeedback(const RtcpCastMessage& cast_feedback) {
     if (duplicate_ack_counter_ >= 2 && duplicate_ack_counter_ % 3 == 2) {
       VLOG(1) << SENDER_SSRC << "Received duplicate ACK for frame "
               << latest_acked_frame_id_;
+      TRACE_EVENT_INSTANT2(
+        "cast.stream", "Duplicate ACK", TRACE_EVENT_SCOPE_THREAD,
+        "ack_frame_id", cast_feedback.ack_frame_id,
+        "last_sent_frame_id", last_sent_frame_id_);
       ResendForKickstart();
     }
   } else {
@@ -316,6 +326,18 @@ void FrameSender::OnReceivedCastFeedback(const RtcpCastMessage& cast_feedback) {
       is_audio_ ? AUDIO_EVENT : VIDEO_EVENT,
       GetRecordedRtpTimestamp(cast_feedback.ack_frame_id),
       cast_feedback.ack_frame_id);
+  if (!duplicate_ack_counter_) {
+    if (have_valid_rtt) {
+      TRACE_EVENT_ASYNC_END1("cast.stream",
+          is_audio_ ? "Audio Transport" : "Video Transport",
+          cast_feedback.ack_frame_id,
+          "RTT", current_round_trip_time_.ToInternalValue());
+    } else {
+      TRACE_EVENT_ASYNC_END0("cast.stream",
+          is_audio_ ? "Audio Transport" : "Video Transport",
+          cast_feedback.ack_frame_id);
+    }
+  }
 
   const bool is_acked_out_of_order =
       static_cast<int32>(cast_feedback.ack_frame_id -
@@ -332,6 +354,11 @@ void FrameSender::OnReceivedCastFeedback(const RtcpCastMessage& cast_feedback) {
     }
     transport_sender_->CancelSendingFrames(ssrc_, cancel_sending_frames);
     latest_acked_frame_id_ = cast_feedback.ack_frame_id;
+  } else {
+    TRACE_EVENT_INSTANT2(
+        "cast.stream", "ACK out of order", TRACE_EVENT_SCOPE_THREAD,
+        "ack_frame_id", cast_feedback.ack_frame_id,
+        "latest_acked_frame_id", latest_acked_frame_id_);
   }
 }