Add periodic logging of number of captured and dropped frames in VideoCaptureInput.

webrtc/video/video_capture_input.h

Index: webrtc/video/video_capture_input.h
diff --git a/webrtc/video/video_capture_input.h b/webrtc/video/video_capture_input.h
index 5877f6c94fd00f14581e689f74987f888721c1cf..98028c44dfdcec0bec311f548635891174e61aa4 100644
--- a/webrtc/video/video_capture_input.h
+++ b/webrtc/video/video_capture_input.h
@@ -62,6 +62,10 @@ class VideoCaptureInput : public webrtc::VideoCaptureInput {
   const int64_t delta_ntp_internal_ms_;
 
   OveruseFrameDetector* const overuse_detector_;
+
+  int64_t last_frame_log_ms_;
+  int captured_frame_count_;
+  int dropped_frame_count_;
 };
 
 }  // namespace internal