Allow schedule CALayer overlays with unbound textures.
Allow schedule CALayer overlays with unbound textures.

RGB_YCBCR_420V_CHROMIUM format doesn't support binding the image to
a texture.
The decoded can copy the image to a destination texture if needed.

This means that when trying to schedule a texture for an overaly the
texture could be in a different state than Texture::BOUND.

BUG=524582

Review URL: https://codereview.chromium.org/1679203002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#374515}

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