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Instead of OverlayCheck_Params and OverlayCheckReturn_Params, use
OverlaySurfaceCandidate and OverlayStatus respectively. The IPC structs
are going away in the long term with the switch to mojo and they
prevent us from adding more fields that may not be serializable (e.g.
NativePixmap).

Bug: 756454
Change-Id: I8fc8c975cd1f67706329c8ea9a38503e196068a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1850537
Commit-Queue: Saman Sami <samans@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706575}