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Opens an image editor, an Essential App's Backlight from an edit button in a screenshot notification.

Important Note: the edit button is only available
for image screen capturing but not video.

Testing:
- Screen recording showing that edit button open the screenshot image in Backlight
https://bugs.chromium.org/p/chromium/issues/attachment?aid=469945&signed_aid=7kntFxv5qL2TWN8JYNxQ4Q==&inline=1

Bug: 1135247
Change-Id: Ia9f48cd82021b96fc3bbda8f140e90477b1a0152
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2457306
Commit-Queue: Cattalyya Nuengsigkapian <cattalyya@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815845}