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}