GitLab

Responses need to be matched to their request. So add a unique
identifier to ensure the client can match the response to the
appropriate request.

Bug: b/132811925
Test: Compiled
Change-Id: I8358e5baed4922de2960a8eebd712443473bebdb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1833483Reviewed-by: Alex Sakhartchouk <alexst@chromium.org>
Commit-Queue: Daniel Nicoara <dnicoara@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701661}