For a more thorough/high level overview of the entire WebXR stack, please refer to components/webxr
device/vr abstracts WebXR features across multiple platforms.
Although the directory is named “vr” both VR and AR features are implemented here. The name is an artifact from the time when it was associated with the now deprecated WebVR API.
Windows and Android are the primary supported platforms, largely because they're the only platforms with significant XR device traction at this point. Several native APIs are supported for various use cases, though things are trending towards OpenXR being the only API used on desktops.
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Integrations with some APIs (such as AR Core) are partially locaed in chrome/browser/vr due to architectural and historical limitations. In the future those will ideally be migrated to this directory as well.
On Windows, the device code runs in a sandboxed utility process. The Chrome installers (e.g. mini_installer) and test setup scripts, will ensure that the appropriate permissions (ACLs) are set on the install directory to run in the sandbox. However, if you wish to build and run the code from your local out directory directly, you will need to either disable the sandbox (not recommended as it could lead to an accidental compat issue) or manually set these permissions. The permissions will persist, so the commands need only be run once per out-directory.
To set the appropriate ACLs run:
icacls <chromium out directory> /grant *S-1-15-3-1024-3424233489-972189580-2057154623-747635277-1604371224-316187997-3786583170-1043257646:(OI)(CI)(RX) icacls <chromium out directory> /grant *S-1-15-3-1024-2302894289-466761758-1166120688-1039016420-2430351297-4240214049-4028510897-3317428798:(OI)(CI)(RX)