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This change decouples the DisplaySnapshot from the DrmDisplay since the
snapshot is only needed to IPC the display information to the browser
process. Also, move all the display configuration calls into the
DrmDisplay object to simplify state and clarify the intent of the
operations.

This change also moves the logic to parse the DRM display state into
DisplaySnapshot objects into a common location intended to be used by
both GPU and Browser processes. The parsing logic will be used in a
subsequent change to allow proper parsing of display configuration on
the browser side during startup.

BUG=484294

Review URL: https://codereview.chromium.org/1129923004

Cr-Commit-Position: refs/heads/master@{#329462}