b2540bb99f
Adds support for exponentially probing the bandwidth at start-up to allow ramp-up to real capacity of the network. BUG=webrtc:6332 R=philipel@webrtc.org, stefan@webrtc.org Review URL: https://codereview.webrtc.org/2235373004 . Cr-Commit-Position: refs/heads/master@{#14189}