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jbroman authored
In particular: - when hovering or pressing the thumb, repaint only the thumb - when thumb position changes, repaint the track only if it changes (e.g. due to a button being disabled upon reaching the end) BUG=549277 Review URL: https://codereview.chromium.org/1525803002 Cr-Commit-Position: refs/heads/master@{#367082}
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