Remove use of SetEncodingDataInternal in MediaOptimization.

Add method FilenameWithParams to TestConfig.

Bug: none
Change-Id: I9f683e661537148dc01bee25f7510938fa656dc5
Reviewed-on: https://webrtc-review.googlesource.com/21382
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Commit-Queue: Åsa Persson <asapersson@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20651}

modules/video_coding/codecs/test/test_config.h

@@ -57,6 +57,7 @@ struct TestConfig {
   std::vector<FrameType> FrameTypeForFrame(int frame_idx) const;
   std::string ToString() const;
   std::string CodecName() const;
+  std::string FilenameWithParams() const;
 
   // Plain name of YUV file to process without file extension.
   std::string filename;