This is a trivial change to add more logs in DX capturer components for
debugging purpose.
Bug: chromium:764258
Change-Id: I406127d838a522f0226720434e840c7163b4719d
Reviewed-on: https://webrtc-review.googlesource.com/3541
Commit-Queue: Zijie He <zijiehe@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#19960}