Add rtpdump and rtc log functionality to screenshare_loopback and video_loopback

webrtc/video/video_quality_test.h

Index: webrtc/video/video_quality_test.h
diff --git a/webrtc/video/video_quality_test.h b/webrtc/video/video_quality_test.h
index 0221f68993a0341e070e32839b9998b0edf71165..a220e6bb837f5f320f125c0e59544f92bbeabf12 100644
--- a/webrtc/video/video_quality_test.h
+++ b/webrtc/video/video_quality_test.h
@@ -86,6 +86,8 @@ class VideoQualityTest : public test::CallTest {
       bool infer_streams;
     } ss;
     int num_thumbnails;
+    std::string rtc_event_log_name;
+    std::string rtp_dump_name;

[sprang_webrtc, 2017/07/12 13:27:06]

Could you perhaps create a new substruct here called Logging or something like
that? Then we can move these two, the |logs| boolean and encoded_frame_base_path
there.

Also, shouldn't num_thumbnails be in the Video section?

[ilnik, 2017/07/12 13:58:53]

Done. 
num_thumbnails is more of a call property, not a video. Moved it there.

   };
 
   VideoQualityTest();