Auto merge of #26525 - kunalmohan:share-gpu_id_hub, r=jdm

Share single gpu_id_hub among all threads in a process

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An id_hub for a content process is created when a new script thread is created. This is then cloned whenever a new globalscope object is created. The only exception being service workers because they exist in separate processes, for them a new hub is created.
r?@jdm @kvark

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- [X] These changes fix #25725 (GitHub issue number if applicable)

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