Add field trial for rampup in quality based on available bandwidth.

Bug: none
Change-Id: I32e1ea6fb2f2e20fc631e09b02c8f3a11b6c9fac
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/158888
Reviewed-by: Niels Moller <nisse@webrtc.org>
Reviewed-by: Sergey Silkin <ssilkin@webrtc.org>
Commit-Queue: Åsa Persson <asapersson@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29751}
diff --git a/video/BUILD.gn b/video/BUILD.gn
index de35ec9..eb714db 100644
--- a/video/BUILD.gn
+++ b/video/BUILD.gn
@@ -218,6 +218,7 @@
     "../rtc_base/experiments:alr_experiment",
     "../rtc_base/experiments:balanced_degradation_settings",
     "../rtc_base/experiments:field_trial_parser",
+    "../rtc_base/experiments:quality_rampup_experiment",
     "../rtc_base/experiments:quality_scaler_settings",
     "../rtc_base/experiments:quality_scaling_experiment",
     "../rtc_base/experiments:rate_control_settings",