GitLab

Send a request to the plugin upon detecting a 'paint-thumbnail' event.
Set the thumbnail's image data upon receiving a response.

Bug: 652400
Change-Id: I3e8faa5a1cc15fbd274c9e641078d6aa8de7ec8d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2412968
Commit-Queue: Daniel Hosseinian <dhoss@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811481}