Device name: S7

From "Settings > About Chrome"
Application version: Canary 65.0.3325.0 on Android
Operating system: 7

Steps to reproduce:
Open new context menu on any item

Expected result:

Showing '(already opened') below "Open in new tab / Open in incognito tab" menu options when link / picture is already opened in any tab. This will help for avoiding opening duplicates.

Note:

More FR than bug