[w3ctag/design-reviews] Compute Pressure API (#621)

Ya ya yawm TAG!

I'm requesting a TAG review of the Compute Pressure API.

We propose a new API that conveys the utilization of CPU resources on the user's device. This API targets applications that can trade off CPU resources for an improved user experience. For example, many applications can render video effects with varying degrees of sophistication. These applications aim to provide the best user experience, while avoiding driving the user's device in a high CPU utilization regime.

High CPU utilization is undesirable because it strongly degrades the user experience. Many smartphones, tablets and laptops become uncomfortably hot to the touch. The fans in laptops and desktops become so loud that they disrupt conversations or the users’ ability to focus. In many cases, a device under high CPU utilization appears to be unresponsive, as the operating system may fail to schedule the threads advancing the task that the user is waiting for.

  - Explainer¹ (minimally containing user needs and example code): https://github.com/oyiptong/compute-pressure/blob/main/README.md

  - Security and Privacy self-review²: https://github.com/oyiptong/compute-pressure/blob/main/security-privacy-self-assessment.md

  - GitHub repo (if you prefer feedback filed there): https://github.com/oyiptong/compute-pressure/

  - Primary contacts (and their relationship to the specification):
      - Olivier Yiptong (@oyiptong), Google
      - Victor Costan (@pwnall), Google
  - Organization/project driving the design: Google/Fugu
  - External status/issue trackers for this feature (publicly visible, e.g. Chrome Status): https://chromestatus.com/feature/5597608644968448


Further details:

  - [✔️] I have reviewed the TAG's [Web Platform Design Principles](https://w3ctag.github.io/design-principles/)
  - The group where the incubation/design work on this is being done (or is intended to be done in the future):
    - WICG
  - The group where standardization of this work is intended to be done ("unknown" if not known):
    - WebPerf WG
  - Existing major pieces of multi-stakeholder review or discussion of this design:
    - https://bugs.chromium.org/p/chromium/issues/detail?id=1067627

  - Major unresolved issues with or opposition to this design:
    - Currently none
  - This work is being funded by: Google

We'd prefer the TAG provide feedback as (please delete all but the desired option):
  ☂️ open a single issue in our GitHub repo **for the entire review**


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https://github.com/w3ctag/design-reviews/issues/621