Signal detailed packet info for each packet sent.

Per-packet info is now signaled in SentPacket to provide useful stats
for bandwidth consumption and overhead analysis in the network stack.

Bug: webrtc:9103
Change-Id: I2b8f6491567d0fa54cc559fc5a96d7aac7d9565e
Reviewed-on: https://webrtc-review.googlesource.com/66281
Commit-Queue: Qingsi Wang <qingsi@google.com>
Reviewed-by: Taylor Brandstetter <deadbeef@webrtc.org>
Reviewed-by: Bjorn Mellem <mellem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22834}
diff --git a/rtc_base/BUILD.gn b/rtc_base/BUILD.gn
index 1f8e5cc..35c9da8 100644
--- a/rtc_base/BUILD.gn
+++ b/rtc_base/BUILD.gn
@@ -805,6 +805,7 @@
     "sigslot.cc",
     "sigslot.h",
     "sigslotrepeater.h",
+    "socket.cc",
     "socket.h",
     "socketadapters.cc",
     "socketadapters.h",