Allowing buffering a LNTF (loss notification) feedback message in RTCPSender

Loss notifications may either be sent immediately, or wait until another
RTCP feedback message is sent.

Bug: webrtc:10336
Change-Id: I40601d9fa1dec6c17b2ce905cb0c8cd2dcff7893
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/139242
Commit-Queue: Elad Alon <eladalon@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28142}
diff --git a/DEPS b/DEPS
index 7c952ac..1ce18e6 100644
--- a/DEPS
+++ b/DEPS
@@ -1633,6 +1633,7 @@
   "+absl/algorithm/container.h",
   "+absl/base/attributes.h",
   "+absl/base/config.h",
+  "+absl/base/macros.h",
   "+absl/container/inlined_vector.h",
   "+absl/memory/memory.h",
   "+absl/meta/type_traits.h",