WebHID Testing

Automated testing for the WebHID API uses MojoJS to override the implementation of the HidService Mojo interface with a testing version in /resources/chromium/fake-hid.js.

Most of these tests can be upstreamed to the Web Platform Tests repository by creating an abstraction between the test cases and this Chromium-specific test API similar to what has been done for WebUSB and Web Serial.

Tests with the "-manual" suffix do not use the test-only interface and expect a real hardware device to be connected. The specific characteristics of the device are described in each test.