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Only consider the system to have dual GPUs if one is an Intel GPU and
the other isn't. This avoids problems where recent Mac Pros which
contain dual AMD GPUs are considered to be "dual-GPU". One symptom was
a 300 ms scroll lag on these machines once idle for 10 seconds as
described in https://codereview.chromium.org/1147653002/ .

BUG=380026

Review URL: https://codereview.chromium.org/1144843005

Cr-Commit-Position: refs/heads/master@{#330471}