Add support for stable bitrate target in SvcRateAllocator

Bug: webrtc:10126
Change-Id: I1362d183bb91510db4e2763a779bcdf681d855ef
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/149069
Reviewed-by: Florent Castelli <orphis@webrtc.org>
Commit-Queue: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29066}
diff --git a/modules/video_coding/BUILD.gn b/modules/video_coding/BUILD.gn
index 33c893d..eafbd39 100644
--- a/modules/video_coding/BUILD.gn
+++ b/modules/video_coding/BUILD.gn
@@ -444,9 +444,12 @@
     "../..:webrtc_common",
     "../../api/video:video_bitrate_allocation",
     "../../api/video:video_bitrate_allocator",
+    "../../api/video:video_codec_constants",
     "../../api/video_codecs:video_codecs_api",
     "../../common_video",
     "../../rtc_base:checks",
+    "../../rtc_base/experiments:stable_target_rate_experiment",
+    "//third_party/abseil-cpp/absl/container:inlined_vector",
   ]
 }