EncoderInfoSettings: Add common string which applies to all encoders.

Change "-LibvpxVp9Encoder-" to "-VP9-" for consistency.

Bug: none
Change-Id: I7a73759db00e92286fe9a4bbed8512baf91decdb
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/206982
Reviewed-by: Sergey Silkin <ssilkin@webrtc.org>
Commit-Queue: Åsa Persson <asapersson@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33249}

rtc_base/experiments/encoder_info_settings.cc

@@ -51,6 +51,11 @@ EncoderInfoSettings::EncoderInfoSettings(std::string name)
            [](BitrateLimit* b) { return &b->max_bitrate_bps; })},
       {});
 
+  if (field_trial::FindFullName(name).empty()) {
+    // Encoder name not found, use common string applying to all encoders.
+    name = "WebRTC-GetEncoderInfoOverride";
+  }
+
   ParseFieldTrial({&bitrate_limits, &requested_resolution_alignment_,
                    &apply_alignment_to_all_simulcast_layers_},
                   field_trial::FindFullName(name));
@@ -79,6 +84,6 @@ LibvpxVp8EncoderInfoSettings::LibvpxVp8EncoderInfoSettings()
     : EncoderInfoSettings("WebRTC-VP8-GetEncoderInfoOverride") {}
 
 LibvpxVp9EncoderInfoSettings::LibvpxVp9EncoderInfoSettings()
-    : EncoderInfoSettings("WebRTC-LibvpxVp9Encoder-GetEncoderInfoOverride") {}
+    : EncoderInfoSettings("WebRTC-VP9-GetEncoderInfoOverride") {}
 
 }  // namespace webrtc