Add field trial for vp8 cpu speed configuration for arm.

Bug: none
Change-Id: I90c2475a229a1f10016e2ad84029e19b5a4f9966
Reviewed-on: https://webrtc-review.googlesource.com/c/107340
Commit-Queue: Åsa Persson <asapersson@webrtc.org>
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25484}
diff --git a/modules/video_coding/BUILD.gn b/modules/video_coding/BUILD.gn
index 0e4805d..ff1e202 100644
--- a/modules/video_coding/BUILD.gn
+++ b/modules/video_coding/BUILD.gn
@@ -425,6 +425,7 @@
     "../../rtc_base:checks",
     "../../rtc_base:rtc_base_approved",
     "../../rtc_base:rtc_numerics",
+    "../../rtc_base/experiments:cpu_speed_experiment",
     "../../system_wrappers",
     "../../system_wrappers:field_trial",
     "../../system_wrappers:metrics",