Changes: * Prefix sections with "==>" and "-->" headers. * Add some more newlines. Motivation: Make output more quickly parsed by humans. BUG=webrtc:8448 Change-Id: I02118e2c25eeae3534285cfe756d8b4818997659 Reviewed-on: https://webrtc-review.googlesource.com/56120 Commit-Queue: Rasmus Brandt <brandtr@webrtc.org> Reviewed-by: Sergey Silkin <ssilkin@webrtc.org> Cr-Commit-Position: refs/heads/master@{#22153}