Improve logging and add DCHECKs in codec database.

BUG=
R=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/47719004

Cr-Commit-Position: refs/heads/master@{#8842}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8842 4adac7df-926f-26a2-2b94-8c16560cd09d
2 files changed