Add ability to specify if rate controller of video encoder is trusted.

If rate controller is trusted, we disable the frame dropper in the
media optimization module.

Bug: webrtc:9722
Change-Id: I821f21fd74a400ee9d5aa3f6b42d4e569033acbe
Reviewed-on: https://webrtc-review.googlesource.com/c/105020
Commit-Queue: Erik Språng <sprang@webrtc.org>
Reviewed-by: Per Kjellander <perkj@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25107}

modules/video_coding/codecs/test/videoprocessor_unittest.cc

@@ -11,6 +11,7 @@
 #include <memory>
 
 #include "absl/memory/memory.h"
+#include "api/test/mock_video_encoder.h"
 #include "api/test/videocodec_test_fixture.h"
 #include "api/video/i420_buffer.h"
 #include "common_types.h"  // NOLINT(build/include)