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This patch is to delay starting `UntrustedModulesProcessor` to avoid processing a massive amount of loaded modules in the browser process during startup. To achive that, this patch introduces "unblock-untrusted-modules-thread" notification. Before the notification, `UntrustedModulesProcessor` is created but marked as not ready. This means the processor does not go beyond `ScheduleNonEmptyQueueProcessing`. Once the notification is observed, we propagate it to all existing child processes, and afterward `UntrustedModulesProcessor` in new processes will be marked ready from the beginning. Differential Revision: https://phabricator.services.mozilla.com/D140123
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