Plot delay feedback in RTCP arrival order.

This fixes a minor bug in the event_log_visualizer where packets are
processed in RTP send time order rather than RTCP arrival time order.
The bug makes time appear to move backwards if RTCP feedback for a later
RTP packet arrives before the feedback of an earlier RTP packet.

Bug: None
Change-Id: I06e8a25d5c65602bedcfd9e4ea1d23874bee9318
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/156169
Commit-Queue: Björn Terelius <terelius@webrtc.org>
Reviewed-by: Sebastian Jansson <srte@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29448}
diff --git a/rtc_tools/BUILD.gn b/rtc_tools/BUILD.gn
index c99ed9b..8d09587 100644
--- a/rtc_tools/BUILD.gn
+++ b/rtc_tools/BUILD.gn
@@ -305,6 +305,7 @@
         "../rtc_base:rtc_base_approved",
         "../rtc_base:rtc_numerics",
         "../rtc_base:stringutils",
+        "//third_party/abseil-cpp/absl/algorithm:container",
         "//third_party/abseil-cpp/absl/strings",
       ]
     }