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Links now appear in var() functions in the Styles panel of DevTools to
allow users to jump to where custom properties are defined.

This change adds a new state to the DevToolsAction enum so we can record
when users click these links.

Frontend CL: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2451605/

Bug: 1124707
Change-Id: Ib38e57689973a94cf68837234d1bf66653e8d5fc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2451925Reviewed-by: Alex Rudenko <alexrudenko@chromium.org>
Commit-Queue: Patrick Brosset <patrick.brosset@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#814809}