[PCLF] Add ToString method to VideoDumpOptions

Bug: None
Change-Id: Idc5e72ba0706bdd9b48983f8f4d2f35255bd9ba4
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/272551
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Auto-Submit: Artem Titov <titovartem@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#37865}

api/test/peerconnection_quality_test_fixture.cc

@@ -175,6 +175,15 @@ absl::optional<std::string> PeerConnectionE2EQualityTestFixture::
   return GetOutputDumpFileName(stream_label, receiver) + ".frame_ids.txt";
 }
 
+std::string PeerConnectionE2EQualityTestFixture::VideoDumpOptions::ToString()
+    const {
+  rtc::StringBuilder out;
+  out << "{ output_directory_=" << output_directory_
+      << ", sampling_modulo_=" << sampling_modulo_
+      << ", export_frame_ids_=" << export_frame_ids_ << " }";
+  return out.Release();
+}
+
 PeerConnectionE2EQualityTestFixture::VideoConfig::VideoConfig(
     const VideoResolution& resolution)
     : width(resolution.width()),

api/test/peerconnection_quality_test_fixture.h

@@ -262,6 +262,8 @@ class PeerConnectionE2EQualityTestFixture {
         absl::string_view stream_label,
         absl::string_view receiver) const;
 
+    std::string ToString() const;
+
    private:
     std::string output_directory_;
     int sampling_modulo_ = 1;