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In order to be able to promote a buffer to full screen overlay on CrOS
the buffer needs to be in an RGB format and resource_size_in_pixels
has to be set on the quad.

This CL makes sure overlay candidates coming from exo satisfy those
two requirements.

BUG=b/29430506

Review-Url: https://codereview.chromium.org/2160113002
Cr-Commit-Position: refs/heads/master@{#406136}