To summarize zmo@ from email:

In https://codereview.chromium.org/2765593002, there is a slight logic
change.  Before we fill GPUInfo fields even if we encounter some
failures during info collection.

After this CL, collection happens in ANGLE, and if there is an error,
we don't fill GPUInfo at all, therefore we get empty fields
(vendor/device IDs, machine model).

So in the reported machines, we definitely run into some collection
error.  I am building a special build to figure out where the error
happens.

In the meantime, Corentin, can we make the collection code more
tolerant? i.e., even if we encounter a failure, we will return as much
info as possible?