[SavedTabGroups] Add metric to keep track of active groups Adds the following metrics: - TabGroups.SavedTabGroupActiveCount A group is marked active if it was modified within the last 30 days. Change-Id: Ie0ba9548bfdbba243fa6f56c86e226125f160ae3 Bug: 337055447 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5522351 Commit-Queue: Darryl James <dljames@chromium.org> Reviewed-by: Dana Fried <dfried@chromium.org> Cr-Commit-Position: refs/heads/main@{#1297860}
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