[Chromium] Inline vector sizes for Regions for paint culling
Some thoughts. Build aura and see how many RenderSurfaces you get in the Browser-side compositor when you open up 9 windows and play around with the WM. How many spans/segments do you get in each Region?
For the Region, andersca suggested 32 segments and 16 spans would make good inline values, in https://bugs.webkit.org/show_bug.cgi?id=72294.
Landed the Region::contains() CL #72294 which adds inline sizes to the Region vectors.