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This CL uses the special reader/writer added by [1] to check
that it's working.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/2209961

BUG=1066670
R=msisov
CC=sky

Change-Id: I09c83827145916366f283e2bac93ed03d5db113a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2212976
Auto-Submit: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Maksim Sisov <msisov@igalia.com>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772383}