Reland of BWE allocation strategy

TBR=stefan@webrtc.org,alexnarest@webrtc.org

Bug: webrtc:8243
Change-Id: Ie68e4f414b2ac32ba4e64877cb250fabcb089a07
Reviewed-on: https://webrtc-review.googlesource.com/13940
Commit-Queue: Alex Narest <alexnarest@webrtc.org>
Reviewed-by: Alex Narest <alexnarest@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20369}
diff --git a/rtc_base/BUILD.gn b/rtc_base/BUILD.gn
index eddef51..443d32e 100644
--- a/rtc_base/BUILD.gn
+++ b/rtc_base/BUILD.gn
@@ -113,6 +113,8 @@
     "bind.h",
     "bitbuffer.cc",
     "bitbuffer.h",
+    "bitrateallocationstrategy.cc",
+    "bitrateallocationstrategy.h",
     "buffer.h",
     "bufferqueue.cc",
     "bufferqueue.h",