See (first builds to fail) https://build.chromium.org/p/chromium.gpu.fyi/builders/Win10%20Debug%20%28NVIDIA%29/builds/833 https://build.chromium.org/p/chromium.gpu.fyi/builders/Win7%20Debug%20%28AMD%29/builds/1586 https://build.chromium.org/p/chromium.gpu.fyi/builders/Win7%20Release%20%28AMD%29/builds/2267 and https://build.chromium.org/p/chromium.gpu.fyi/builders/Win7%20x64%20Release%20(NVIDIA)

https://chromium.googlesource.com/angle/angle.git/+/e93dabaaa29070814eb9ec3af155ab81436a534b is in all those ranges, so it might be the cause. I don't see any relevant changes to Chrome in that range.