GitLab

This roll includes:
  - [inspector_protocol] first class citizien .pdl support

+ migrated cros_protocol.json to .pdl

TBR=dgozman@chromium.org,dpranke@chromium.org,pfeldman@chromium.org
NOPRESUBMIT=true
Bug:none

Change-Id: I0fff1582bd41115e2aa348008c7a5d48f5c59a7e
Reviewed-on: https://chromium-review.googlesource.com/1014468
Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551382}