DevTools: Event Listeners a11y enhancement
DevTools: Event Listeners a11y enhancement

In the Elements Event Listeners pane, one of the things that is
possible due to the "Ancestors" inclusion is that a parent element
with an event listener can be navigated-to via a mouse click on
the element name. This functionality is now extended to keyboard-
only users by handling the enter keypress for that same tree node.

Change-Id: I7603c43991079af24cbf749b10ff270928945d21
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1815820
Reviewed-by: Yang Guo <1cf0af8245a3a17a632a2c73531392b0f9761c76@chromium.org>
Commit-Queue: Robert Paveza <7787129de3d0cb4911c68d958db3023863584560@microsoft.com>
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#699407}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 05c666ae81e9d5fe82b15987e3112822d3c2f347

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