This directory contains ContentCapture which is for capturing on-screen text content and streaming it to a client.
The implementation injects a cc::NodeId into cc::DrawTextBlobOp in paint stage, schedules a best-effort task to retrieve on-screen text content (using an r-tree to capture all cc::NodeId intersecting the screen), and streams the text out through ContentCaptureClient interface. The ContentCaptureTask is a best-effort task in the idle queue and could be paused if there are higher-priority tasks.