In Issue 614526, more bots with NVIDIA GPUs were deployed onto Chromium's commit queue. The Chromium project is facing scalability problems with the GPU machines. Some of the configurations are either over capacity or near capacity. The Windows machines with AMD GPUs are one of these configurations. It is necessary to either buy more such machines or stop loading them so heavily.
For this reason the Windows AMD configuration will be removed from Chromium's commit queue. The drivers have unfortunately been unreliable from the start (see Issue 491419 ). They will continue to be run against ANGLE's tryjobs, and could be run against other key components (Skia and V8's rolls come to mind).
Comment 1 by bugdroid1@chromium.org
, Jun 29 2016