Lesson learned: Take screenshots of AOSP code changes because you never know when Google might make them private.
All I have as evidence of this feature is a screenshot of the tabs I had open before.
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From what I remember reading, Google is introducing a new power hint to boost the CPU when a game is loading something. Through a new GameState API, games can communicate their current state to the platform. This feature is planned for Android 13, based on a new VTS test.
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Google has already submitted a patch to update the Pixel's power HAL, but other devices upgrading from Android 12 --> Android 13 might not support this because of GRF.
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// GAME_LOADING mode is required for all devices which ship on Android T or later
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