Debounce watching of thumbnails.
Instead of watching and unwatching the thumbnail associated with a hover card every time the mouse moves on or off a tab (or something grabs mouse focus) we now watch a handful of thumbnails of tabs we've recently hovered. Note that re-watching a tab with a valid thumbnail is mostly a no-op. Bug: 1021332 Change-Id: I55646c89514a001052cd6d453ffe3a3b6e11a731 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1899388 Auto-Submit: Dana Fried <dfried@chromium.org> Reviewed-by:Caroline Rising <corising@chromium.org> Commit-Queue: Caroline Rising <corising@chromium.org> Cr-Commit-Position: refs/heads/master@{#712810}
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