The fact that they weren't const is probably a remenant of the good ol'
days this class being multi-threaded and having to acquire mutexes. Now
they can properly be made const.
In order to make GetConstAdaptCounter() const, this CL makes sure a
cleared adapt_counters_ map contains mappings for all degradation
preferences to default-constructed AdaptCounters. Previously, if the
mapping was missing it was implicitly inserted by
GetConstAdaptCounter(). Now it can DCHECK that mappings always exists
instead, and it always has something to return.
Bug: webrtc:11222
Change-Id: If33227fe6572eb1d6cc6b9f851d6d174d035c110
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/168953
Commit-Queue: Henrik Boström <hbos@webrtc.org>
Reviewed-by: Evan Shrubsole <eshr@google.com>
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30611}
d6fb409d46