Don't know if it was available when question was posted. But someone called me today and it appeared that there was no context menu on the tabs in Android Chrome, but that is not entirely true.
In Chrome on Android to close all tabs, long press on the "x" on any tab, to get the "close all tabs".
I've seen a posting to close tabs by long pressing on the tabs count at the right, but I don't have that. In Windows desktop use Ctrl+Shift+W, or the tab context menu.
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Looks like I selected a different version of question when I got past all the sign-in stuff and that this one did get answered. In other forums a correct answer would be marked by the original poster and appear immediately with the question. The second page did not come up originally on my Android and was delayed in Windows as well.