The provided document offers a comprehensive technical explanation of the lifecycle of a raster-inducing scroll within Google Chrome's rendering architecture, specifically focusing on the RenderingNG system and Viz process. It details the complex, multi-threaded pipeline that begins with input event handling on the browser and compositor threads, where scroll events are routed to the faster compositor thread to ensure visual responsiveness. The core of the document examines the division of labor between the main thread (Blink), which synchronizes state and handles new content painting (generating display lists), and the compositor thread, which manages tiling and parallel rasterization to convert paint data into GPU-ready textures, often utilizing low-resolution tiles to prevent visual artifacts like checkerboarding. Finally, the text covers the compositor frame assembly and GPU submission phases, and concludes by discussing crucial debugging tools and performance metrics used to analyze scroll smoothness, such as frame rate, input latency, and checkerboarding rates.