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Formerly the product id for the DisplaySnapshot was generated with a
combination of the manufacturer code combined with a hash of the product
display name. However as the product display name can vary based on
display connector it is more appropriate to use the product code.

TEST=display_unittests passes.
BUG=471749

Review URL: https://codereview.chromium.org/1151583002

Cr-Commit-Position: refs/heads/master@{#330929}