Add aecdump experiment strings for injected custom processors

Bug: None
Change-Id: I41aaae454212db3a871d356e0124b868d67033b6
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/168683
Reviewed-by: Per Ã…hgren <peah@webrtc.org>
Commit-Queue: Sam Zackrisson <saza@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30544}
diff --git a/modules/audio_processing/audio_processing_impl.cc b/modules/audio_processing/audio_processing_impl.cc
index 5cdfe37..375e179 100644
--- a/modules/audio_processing/audio_processing_impl.cc
+++ b/modules/audio_processing/audio_processing_impl.cc
@@ -1937,6 +1937,12 @@
       kClippedLevelMin) {
     experiments_description += "AgcClippingLevelExperiment;";
   }
+  if (!!submodules_.capture_post_processor) {
+    experiments_description += "CapturePostProcessor;";
+  }
+  if (!!submodules_.render_pre_processor) {
+    experiments_description += "RenderPreProcessor;";
+  }
   if (capture_nonlocked_.echo_controller_enabled) {
     experiments_description += "EchoController;";
   }