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The OverlayPlane struct uses the ScanoutBuffer class, which was
originally a DRM platform implementation detail. This struct was moved
into common code with the intent to share it with other linux platforms.

However, exposing ScanoutBuffer is probably not what we want to do - it
contains several methods that are specific to DRM. Instead, a public
ui::OverlayPlane should be using the gfx::NativePixmap interface, which
is already public.

Move ui::OverlayPlane back into DRM, and rename it to DrmOverlayPlane. A
followup CL will add a new version of ui::OverlayPlane that uses
gfx::NativePixmap instead.

Bug: 851997
Test: compile

Change-Id: I1f4dbc11419aaacabb2a63eb692eb6a3892a3be3
Reviewed-on: https://chromium-review.googlesource.com/1097208
Commit-Queue: Michael Spang <spang@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569702}