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This cl downloads and encodes instrument icon for SPC before it is
written to db.

Bug: 1121021, 1121331
Change-Id: Ifa875ad6a42380fb5f7a7790022f4dd17b835122
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2380142
Commit-Queue: Sahel Sharify <sahel@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802372}