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This extension demonstrates how chrome.printingMetrics API can be used
to fetch print job metadata.
This extension will be used for external documentation as well.

Bug: 992889
Change-Id: I7b874e8961b02ebc8332ef804d9496e6fed35d56
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1852252
Commit-Queue: Nikita Podguzov <nikitapodguzov@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707754}