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jonross authored
Add visual feedback to AppListButton. The background will draw active in response to touch downs. TEST=ShelfViewTest.AppListButtonTouchFeedback, ShelfViewTest.AppListButtonTouchFeedbackCancellation BUG=398398 Review URL: https://codereview.chromium.org/558703002 Cr-Commit-Position: refs/heads/master@{#294814}
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