Scheduling Blocking Tasks in Task Scheduler

[François Doray]

base/ OWNERS and other interested parties: We wrote a doc that describes immediate and future improvements that we plan to make to the way Task Scheduler handles blocking (e.g. I/O, etc.) tasks. PTAL https://docs.google.com/a/chromium.org/document/d/1ynRvQKah3Cx_eLqPS7KzIp8u73HeKIjX7HQqwSWOnF8/edit?usp=sharing

tl;dr

• We will replace .WithFileIO() and .WithWait() with a single .MayBlock() trait.
• [future] We will introduce ScopedMayBlock to notify Task Scheduler when a task is about to block.
• [future] We will take advantage of OS-specific APIs to dynamically adjust the number of threads on which tasks are scheduled based on the number of blocked tasks.

[Gabriel Charette]

s/task-scheduler-dev/scheduler-dev/ as discussed here.

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