グラフィックデバイスのベンダーの識別コード（読み取り専用）
This is the PCI vendor ID of the user's graphics card. This number uniquely identifies a
particular graphics card maker. The number is the same across operating systems and driver versions.
Note that device IDs are only implemented on PC (Windows/Mac/Linux) platforms; on other
platforms you'll have to do name-based detection if needed.
デバイス ID のリストは pcidatabase.com を参照してください。
See Also: SystemInfo.graphicsDeviceID, SystemInfo.graphicsDeviceVendor.