Chrome prefers to use partial swaps (e.g. https://www.khronos.org/registry/EGL/extensions/NV/EGL_NV_post_sub_buffer.txt) when it's available to save on CPU/GPU. Specifically, CC tracks what changes from frame to frame, draws only the part that changed, and pushes the delta to the front buffer.

This is probably blocking using SkiaRenderer on platforms such as Android.