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Previously, there was no way for clients of the surfaces service to appropriately rate-limit their frame submissions. We tried using the "return resources" signal to rate-limit, but that's really a measure of how quickly you're submitting new resources rather than how quickly the system is putting up frames. Currently, only the Sky compositor listens to this signal. Using this signal, we're able to run sky/examples/spinning-square.sky in sync with the surfaces service (that is, submitting exactly one frames every 17ms). R=jamesr@chromium.org Review URL: https://codereview.chromium.org/756673004