Theresa, thanks for the tip about highlighting views.  I tried to make this work with a single menu item but it seems that the context menu is all one view without sub-views.
Becky, do you know if the above is correct?  Maybe we can use a pager-view (ViewPageAdapter) to create a view for the single menu item we want to highlight?

Using an IPH bubble for a single menu item seem problematic because it will cover up other items, so using the highlight Theresa mentioned seems best.

twellington@ wrote on the other issue: I'd look at the in-product help for the download manager that highlights a menu item as a good example of how to do in-product help for a list item. Checkout the code in AppMenu.java related to higlightedItemId.

Another approach would be to just use the text of the menu item to draw attention, e.g. "*Try*: Sneak peek" until the user selects it, then revert to the normal wording.

This change should have been applied to this bug:

  https://chromium.googlesource.com/chromium/src.git/+/7f7c3fbf144d5e84ac32bb4cfa5c054753b88457

commit 7f7c3fbf144d5e84ac32bb4cfa5c054753b88457
Author: Donn Denman <donnd@chromium.org>
Date: Fri Nov 30 01:53:52 2018

[Ephemeral Tab] Add "*New*" to the menu title.

Changes the title of the menu item from "Sneak peek" to
"*New* Sneak peek" to help draw attention to the new choice.

BUG=894619

Change-Id: I1446b191e8891f17452762b5dda4d6203c332510
Reviewed-on: https://chromium-review.googlesource.com/c/1355252
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Donn Denman <donnd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612504}
[modify] https://crrev.com/7f7c3fbf144d5e84ac32bb4cfa5c054753b88457/chrome/android/java/strings/android_chrome_strings.grd

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/57d6795942fc4636a53a092b46363aaa7a93a34e

commit 57d6795942fc4636a53a092b46363aaa7a93a34e
Author: Donn Denman <donnd@chromium.org>
Date: Sat Jan 12 02:10:21 2019

[ET] Update *New* text styling in the context menu.

This makes the "New" text be a superscript, smaller, and colored.

This also makes some minor updates to the SpanApplier:
1) Ability to apply multiple spans to the same region.
2) Changes the doc to say that applying a null span does nothing.

BUG= 902140 

Change-Id: Ifb49fa091d7a2f8a0e07e5ab8b12299eba33d585
Reviewed-on: https://chromium-review.googlesource.com/c/1393674
Commit-Queue: Donn Denman <donnd@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#622265}
[modify] https://crrev.com/57d6795942fc4636a53a092b46363aaa7a93a34e/chrome/android/java/src/org/chromium/chrome/browser/browseractions/BrowserActionsCustomContextMenuItem.java
[modify] https://crrev.com/57d6795942fc4636a53a092b46363aaa7a93a34e/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/ChromeContextMenuItem.java
[modify] https://crrev.com/57d6795942fc4636a53a092b46363aaa7a93a34e/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/ContextMenuItem.java
[modify] https://crrev.com/57d6795942fc4636a53a092b46363aaa7a93a34e/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/TabularContextMenuListAdapter.java
[modify] https://crrev.com/57d6795942fc4636a53a092b46363aaa7a93a34e/chrome/android/java/strings/android_chrome_strings.grd
[modify] https://crrev.com/57d6795942fc4636a53a092b46363aaa7a93a34e/ui/android/java/src/org/chromium/ui/text/SpanApplier.java
[modify] https://crrev.com/57d6795942fc4636a53a092b46363aaa7a93a34e/ui/android/junit/src/org/chromium/ui/text/SpanApplierTest.java

Fixed.  We will probably want to remove the "New" either before full rollout or before going Beta.  Once we have UX help we can start addressing questions like this.