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This pull request is created by [automatic cherry pick workflow](https://github.com/flutter/flutter/blob/main/docs/releases/Flutter-Cherrypick-Process.md#automatically-creates-a-cherry-pick-request) Please fill in the form below, and a flutter domain expert will evaluate this cherry pick request. ### Issue Link: What is the link to the issue this cherry-pick is addressing? https://github.com/flutter/flutter/issues/171691 ### Changelog Description: Fixes a race that can cause crashes in the Impeller Vulkan back end. ### Impact Description: Crashes in apps running on Impeller/Vulkan. ### Workaround: Disable Impeller ### Risk: What is the risk level of this cherry-pick? ### Test Coverage: Are you confident that your fix is well-tested by automated tests? ### Validation Steps: The crash does not happen consistently. One way that I have been able to reproduce it is: * run Gallery with Impeller/Vulkan on a slow phone * scroll through the Shrine screen and start a lot of image decodes * quickly exit the app before the decodes have completed Without the fix, the app will often crash if an image decode tries to access the Vulkan context after it was partially shut down while exiting the app.
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