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1149491997
To refine its alerts, Performance Stats API needs to be able to know whether a long-running operation is actually causing user-visible jank in the current process. This patch introduces a trivial API that lets clients ask the refresh driver whether any kind of animation is ongoing. --HG-- extra : transplant_source : %81W%81%C9%84H%8E%D4%0A%A8%10E%06%A5%10%60%9A3%2Ch