1This directory has the following layout: 2- base/task/: public APIs for posting tasks and managing task queues. 3- base/task/thread_pool/: implementation of the ThreadPool. 4- base/task/sequence_manager/: implementation of the SequenceManager. 5- base/task/common/: implementation details shared by ThreadPool and 6 SequenceManager. 7 8Apart from embedders explicitly managing a ThreadPoolInstance and/or 9SequenceManager instance(s) for their process/threads, the vast majority of 10users should only need APIs in base/task/. 11 12Documentation: 13 14* [Threading and tasks](/docs/threading_and_tasks.md) 15* [Callbacks](/docs/callback.md) 16* [Vision for future API changes](https://docs.google.com/document/d/1pySz2xeJ6kLlbzDnS2jqAC1F8T_6pLEV8pgaMfURXAw/edit) 17