Handle non-integer frame rates in video codec tests.

Encoder API accepts non-integer frame rate since
https://webrtc-review.googlesource.com/c/src/+/131949.

Bug: webrtc:10812
Change-Id: I5fc9c5dfac4b182b84a735218a2946a95cc2b93c
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/143483
Reviewed-by: Seth Hampson <shampson@webrtc.org>
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Commit-Queue: Sergey Silkin <ssilkin@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28548}

api/test/videocodec_test_fixture.h

@@ -25,7 +25,7 @@ namespace test {
 // Rates for the encoder and the frame number when to apply profile.
 struct RateProfile {
   size_t target_kbps;
-  size_t input_fps;
+  double input_fps;
   size_t frame_num;
 };
 

api/test/videocodec_test_stats.cc

@@ -43,6 +43,7 @@ std::string VideoCodecTestStats::FrameStatistics::ToString() const {
   ss << " decode_time_us " << decode_time_us;
   ss << " rtp_timestamp " << rtp_timestamp;
   ss << " target_bitrate_kbps " << target_bitrate_kbps;
+  ss << " target_framerate_fps " << target_framerate_fps;
   return ss.Release();
 }
 

api/test/videocodec_test_stats.h

@@ -42,6 +42,7 @@ class VideoCodecTestStats {
     bool encoding_successful = false;
     size_t encode_time_us = 0;
     size_t target_bitrate_kbps = 0;
+    double target_framerate_fps = 0.0;
     size_t length_bytes = 0;
     VideoFrameType frame_type = VideoFrameType::kVideoFrameDelta;