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Auto merge of #11205 - pcwalton:avoid-needless-animation-state-change…
…s, r=jdm script: Avoid needless `ChangeRunningAnimationsState` messages during typical `requestAnimationFrame()` animations. This skips useless message traffic when `requestAnimationFrame()` is called during an animation frame callback. It reduces CPU usage of the following snippet by 49%: <script> function foo() { requestAnimationFrame(foo); } </script> <button onclick="foo()">Start rAF</button> Partially addresses #9844. <!-- Reviewable:start --> --- This change is [<img src="https://reviewable.io/review_button.svg" height="35" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/11205) <!-- Reviewable:end -->
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