Enumerate all display adapters to detect AMD switchable graphics.
Enumerate all display adapters to detect AMD switchable graphics.

Keying off of the driver manufacturer name doesn't work on some systems, so use SetupAPI to enumerate all installed display adapters to check if both an AMD and Intel display adapter are installed.

BUG=455046,451420
NOPRESUBMIT=true

Review URL: https://codereview.chromium.org/893993006

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#314923}

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