GitLab

Part of change to collect, upload and expose histogram data
for Cronet.

BUG=441466

Committed: https://crrev.com/4eb0fd47de0736f3f4c970e8d7f8813ef2177886
Cr-Commit-Position: refs/heads/master@{#308239}

Review URL: https://codereview.chromium.org/794493002

Cr-Commit-Position: refs/heads/master@{#308427}